fix expression compile error

[lchrennew]

When running with less 4 and webpack, the compiled result is like this:

translateY(-13.07106781 / 2) rotate(45deg)

This should be solved using parentheses around the expression.

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[tangjinzhou]

ref #3479

[tangjinzhou]

@John60676 review 下那个 px 要加吗？

[John60676]

@John60676 review 下那个 px 要加吗？

那个不用加

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This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.