diff --git a/apps/common/main/resources/less/combo-dataview.less b/apps/common/main/resources/less/combo-dataview.less
index 645eb51cb..969ac9778 100644
--- a/apps/common/main/resources/less/combo-dataview.less
+++ b/apps/common/main/resources/less/combo-dataview.less
@@ -94,7 +94,7 @@
         .border-left-radius(0);
 
         .dataview {
-            @minus-px: calc(-1px / @pixel-ratio-factor);
+            @minus-px: calc((-1px / @pixel-ratio-factor));
             height: @combo-dataview-height;
             height: @combo-dataview-height-calc;
             padding: 0;
@@ -111,7 +111,7 @@
         .box-shadow(none);
 
         @minus-px-ie: -1px;
-        @minus-px: calc(-1px / @pixel-ratio-factor);
+        @minus-px: calc((-1px / @pixel-ratio-factor));
         margin: 0 @minus-px-ie @minus-px-ie 0;
         margin: 0 @minus-px @minus-px 0;
         height: @combo-dataview-height;
diff --git a/apps/common/main/resources/less/slider.less b/apps/common/main/resources/less/slider.less
index b6f193d4b..240da9c2b 100644
--- a/apps/common/main/resources/less/slider.less
+++ b/apps/common/main/resources/less/slider.less
@@ -8,13 +8,13 @@
         .track {
             @track-height: 4px;
             height: @track-height;
-            border: @track-height / 2 solid @border-regular-control-ie;
-            border: @track-height / 2 solid @border-regular-control;
-            border-radius: @track-height / 2;
+            border: (@track-height / 2) solid @border-regular-control-ie;
+            border: (@track-height / 2) solid @border-regular-control;
+            border-radius: (@track-height / 2);
             background-color: @border-regular-control-ie;
             background-color: @border-regular-control;
             width: calc(100% + @track-height);
-            margin-left: -@track-height / 2;
+            margin-left: (-@track-height / 2);
         }
 
         .thumb {
@@ -26,10 +26,10 @@
             border: @scaled-one-px-value solid @icon-normal;
             background-color: @background-normal-ie;
             background-color: @background-normal;
-            border-radius: @thumb-width / 2;
+            border-radius: (@thumb-width / 2);
 
             top: 3px;
-            margin-left: @thumb-width / -2;
+            margin-left: (@thumb-width / -2);
 
             &.active {
             }
@@ -46,14 +46,14 @@
                 height: calc(100% + @track-height);
                 width: @track-height;
                 margin-left: 0;
-                margin-top: -@track-height / 2;
+                margin-top: (-@track-height / 2);
             }
             .thumb {
                 @thumb-width: 12px;
                 top: auto;
                 left: 3px;
                 margin-left: 0;
-                margin-top: @thumb-width / -2;
+                margin-top: (@thumb-width / -2);
             }
         }
     }
diff --git a/apps/common/main/resources/less/spinner.less b/apps/common/main/resources/less/spinner.less
index c1e5d5aab..c9373296e 100644
--- a/apps/common/main/resources/less/spinner.less
+++ b/apps/common/main/resources/less/spinner.less
@@ -18,8 +18,8 @@
         display: block;
         position: relative;
         width: @trigger-width;
-        height: @spin-height/2 - 1;
-        height: calc(@spin-height/2 - 1px/@pixel-ratio-factor);
+        height: (@spin-height/2) - 1;
+        height: calc((@spin-height/2) - (1px/@pixel-ratio-factor));
         padding: 0;
         margin: 0;
         border: none;
diff --git a/apps/common/main/resources/less/synchronize-tip.less b/apps/common/main/resources/less/synchronize-tip.less
index 06b72e9f7..b32a54328 100644
--- a/apps/common/main/resources/less/synchronize-tip.less
+++ b/apps/common/main/resources/less/synchronize-tip.less
@@ -530,7 +530,7 @@
         content: ' ';
         position: absolute;
         left: 7px;
-        left: calc(7px/@pixel-ratio-factor);
+        left: calc((7px/@pixel-ratio-factor));
         top: @scaled-one-px-value-ie;
         top: @scaled-one-px-value;
         height: 14px;
diff --git a/apps/common/main/resources/less/theme-colorpalette.less b/apps/common/main/resources/less/theme-colorpalette.less
index 9d81c90fd..ab2440618 100644
--- a/apps/common/main/resources/less/theme-colorpalette.less
+++ b/apps/common/main/resources/less/theme-colorpalette.less
@@ -16,7 +16,7 @@
 
     a {
         padding: 0;
-        margin: calc(1px - 1px / @pixel-ratio-factor);
+        margin: calc(1px - (1px / @pixel-ratio-factor));
         border: @scaled-one-px-value-ie solid @background-normal-ie;
         border: @scaled-one-px-value solid @background-normal;
         float: left;
diff --git a/apps/common/main/resources/less/window.less b/apps/common/main/resources/less/window.less
index e17517464..6aed928c6 100644
--- a/apps/common/main/resources/less/window.less
+++ b/apps/common/main/resources/less/window.less
@@ -47,7 +47,7 @@
             content: ' ';
             position: absolute;
             left: 7px;
-            left: calc(7px / @pixel-ratio-factor);
+            left: calc((7px / @pixel-ratio-factor));
             top: @scaled-one-px-value-ie;
             top: @scaled-one-px-value;
             height: 14px;
diff --git a/test/spreadsheeteditor/main/resources/less/asc-mixins.less b/test/spreadsheeteditor/main/resources/less/asc-mixins.less
index e6e8a3d7b..c0bf2d9a3 100644
--- a/test/spreadsheeteditor/main/resources/less/asc-mixins.less
+++ b/test/spreadsheeteditor/main/resources/less/asc-mixins.less
@@ -87,8 +87,8 @@
 
     .pixel-ratio__1_5 {
         @ratio: 1.5;
-        @one-px: 1px / @ratio;
-        @two-px: 2px / @ratio;
+        @one-px: (1px / @ratio);
+        @two-px: (2px / @ratio);
 
         --pixel-ratio-factor: @ratio;
         --scaled-one-pixel: @one-px;
@@ -100,8 +100,8 @@
 
     .pixel-ratio__1_25 {
         @ratio: 1.25;
-        @one-px: 1px / @ratio;
-        @two-px: 2px / @ratio;
+        @one-px: (1px / @ratio);
+        @two-px: (2px / @ratio);
 
         --pixel-ratio-factor: @ratio;
         --scaled-one-pixel: @one-px;
@@ -110,8 +110,8 @@
 
     .pixel-ratio__1_75 {
         @ratio: 1.75;
-        @one-px: 1px / @ratio;
-        @two-px: 2px / @ratio;
+        @one-px: (1px / @ratio);
+        @two-px: (2px / @ratio);
 
         --pixel-ratio-factor: @ratio;
         --scaled-one-pixel: @one-px;