因式分解.分式、、1:x²y-2xy+y/y-x²y 其中x=-2 2:a²-3ab/a&
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因式分解.分式、、
1:x²y-2xy+y/y-x²y 其中x=-2
2:a²-3ab/a²-6ab+9b²,其中a=3/2,b=-(2/3)答案是3/7
“/ "为分数线.
急,写到最后卡住了.而且算出的答案与答案不一样.
1:x²y-2xy+y/y-x²y 其中x=-2
2:a²-3ab/a²-6ab+9b²,其中a=3/2,b=-(2/3)答案是3/7
“/ "为分数线.
急,写到最后卡住了.而且算出的答案与答案不一样.
(x²y-2xy+y)/(y-x²y)
=x²-2x+1/1-x²
=(x-1)²/(1-x)(1+X)
=(1-X)/(1+X)
=(1+2)/(1-2)
=-3
a²-3ab/a²-6ab+9b²
=a(a-3b)/(a-3b)²
=a/(a-3b)
=(3/2)/(3/2+3*2/3)
=(3/2)/(3/2+2)
=(3/2)/(7/2)
=(3/2)*(2/7)
=3/7
=x²-2x+1/1-x²
=(x-1)²/(1-x)(1+X)
=(1-X)/(1+X)
=(1+2)/(1-2)
=-3
a²-3ab/a²-6ab+9b²
=a(a-3b)/(a-3b)²
=a/(a-3b)
=(3/2)/(3/2+3*2/3)
=(3/2)/(3/2+2)
=(3/2)/(7/2)
=(3/2)*(2/7)
=3/7
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