(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
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(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
![(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)](/uploads/image/z/16336269-45-9.jpg?t=%28x%26%23178%3B-y%26%23178%3B-2xy%29-3%28-x%26%23178%3B%2Bxy%29-2%28x%26%23178%3B-%E4%BA%8C%E5%88%86%E4%B9%8B%E4%BA%94xy%29)
(x²-y²-2xy)-3(-x²+xy)-2(x²-二分之五xy)
=x^2-y^2-2xy+3x^2-3xy-2x^2+5xy
=2x^2-y^2
=x^2-y^2-2xy+3x^2-3xy-2x^2+5xy
=2x^2-y^2
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
(3x²y-xy²+2xy)/二分之一xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:(xy-x²)×x-y/xy
已知x-y=2,求二分之x²+y²-xy的值
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y