已知x+xy=20,xy+x= -10,求下列代数式的值1.3-4x-4xy+1/2xy+1/2y 2.x-y3.x+2xy+y
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已知x+xy=20,xy+x=-10,求下列代数式的值1.3-4x-4xy+1/2xy+1/2y2.x-y3.x+2xy+y已知x+xy=20,xy+x=-10,求下列代数式的值1.3-4x-4xy+
已知x+xy=20,xy+x= -10,求下列代数式的值1.3-4x-4xy+1/2xy+1/2y 2.x-y3.x+2xy+y
已知x+xy=20,xy+x= -10,求下列代数式的值
1.3-4x-4xy+1/2xy+1/2y 2.x-y
3.x+2xy+y
已知x+xy=20,xy+x= -10,求下列代数式的值1.3-4x-4xy+1/2xy+1/2y 2.x-y3.x+2xy+y
3-4x-4xy+1/2xy+1/2y
=3-80+1/2xy+1/2y
=3-80-5
=-82
x-y
=(x+xy)-(xy+y)
=20+10
=30
x+2xy+y
=(x+xy)+(xy+y)
=20-10
=10
已知条件有错? 大概是①x+xy=20
,②xy+y=-10吧!
1.3-4(x+xy)+1/2(xy+y)
=3-4x20+1/2(-10)
=-82
2.x-y
=①-②
=30
3.x+2xy+y
=(x+xy)+(xy+y)
=20-10
=10
x+xy=20,xy+x= -10,
不对
题目有问题····
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