(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)

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(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
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(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)

(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
=(2x-y)(2x+y+y-4x)+2y(y-3x)
=2(2x-y)(y-3x)+2y(y-3x)
=(4x-2y+2y)(y-3x)
=4x(y-3x)
如果本题有什么不明白可以追问,

42+110/56+110/72+110/90+110/110
=110x(1/30+1/42+1/56+1/72+1/90+1/110)
=110x(1/5-1/6+1/6-1