[4y(2x-y)-2x(2x-y)]÷(2x-y)
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[4y(2x-y)-2x(2x-y)]÷(2x-y)[4y(2x-y)-2x(2x-y)]÷(2x-y)[4y(2x-y)-2x(2x-y)]÷(2x-y)4y(2x-y)-2x(2x-y)除以(2x
[4y(2x-y)-2x(2x-y)]÷(2x-y)
[4y(2x-y)-2x(2x-y)]÷(2x-y)
[4y(2x-y)-2x(2x-y)]÷(2x-y)
4y(2x-y)-2x(2x-y)除以(2x-y)
=(4y-2x)*(2x-y) 乘以1/(2x-y)
=4y-2x