(x+2y)(2x—y)+3x(y—2x)+(x+y)(2x—y),其中:x=2,y=—1
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(x+2y)(2x—y)+3x(y—2x)+(x+y)(2x—y),其中:x=2,y=—1
(x+2y)(2x—y)+3x(y—2x)+(x+y)(2x—y),其中:x=2,y=—1
(x+2y)(2x—y)+3x(y—2x)+(x+y)(2x—y),其中:x=2,y=—1
原式=(x+2y)(2x-y)-3x(2x-y)+(x+y)(2x-y)
=(2x-y)(x+2y-3x+x+y)
=(2x-y)(-x+3y)
当x=2,y=-1时
原式=(2×2+1)(-2-3)
=-25
原式=[(x2+4xy+4y2)-(3x2-xy+3xy-y2)-5y2]÷(2x)
=[ x2+4xy+4y2-3x2+xy-3xy+y2-5y2] ÷(2x)
=[-2x2+2 xy] ÷(2x)
=-x+y
当x=-2,y=时,原式= -(-2)+=2
2(x-y)²-3(x-y)(-y-x)
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2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
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x(x-y)2-(y-x)3
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x