作业帮(2x^2y-3xy+6)-2(3xy^2-xy-3)
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(2x^2y-3xy+6)-2(3xy^2-xy-3)
(2x^2y-3xy+6)-2(3xy^2-xy-3)
(2x^2y-3xy+6)-2(3xy^2-xy-3)
(2x²y-3xy+6)-2(3xy²-xy-3)=2x²y-3xy+6-5xy²+2xy+6=2x²y-xy+5xy²+12
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
（X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程
3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程
2x²y-3(2xy-xy)-xy
x^2-xy-6y^2+3xy+y+2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
( )*3xy=6x^2y+2xy^2
(9x^2y-6xy^2)/3xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x，
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x）
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
(2x^2y-3xy+6)-2(3xy^2-xy-3)
合并同类项：(2xy²+3xy²)-(6x²y-3xy²)
[6xy-3(xy-1/2x的平方y]/3xy=?
3xy乘以[6 xy-3(xy-1/2x的平方y)]
（2xy平方+3xy平方）-（6x平方y-3xy平方）=
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.