已知2x-3y=-7,求3(y+7)-6(x-y)的值帮帮偶啦
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已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²把下列各式分解因式x(x+y)(x-y)-x(y+x)²7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知2x+y=6,x-3y=1,求7y(x-3y)-2(3y-x)的值.
已知X=11Y,(X-2)*3=Y,(X-4)*5=Y,(X-6)*7=Y,(X-8)*9=Y ,求X、Y各是多少?
已知关于方程2x-3y=7,求3(y-7)-6(x-y)
1.已知x,y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值2.已知x+y=2,xy=-½,求x(x+y)²(1-y)-x(y+x)²的值
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值
已知2x-y=-3,求代数式5(x-3y)-2(x-7y)
已知x-y=3,求代数式7-x+y-(x-y)^2的值.-.-
已知方程组{2x+y=6,x-3y=1,不解方程组,求7y(x-3y)²-(3y-x)²的值.已知方程组{2x+y=6,{x-3y=1.不解方程组,求7y(x-3y)²-(3y-x)²的值.已知方程组{2x+y=6,{x-3y=1.不解方程组,求7y(x-3y)²-(3y-x)³
已知2x+y=-6,x-3y=4,在不解方程组的条件下,求7y(x-3y)^2-2(3y-x)^3
已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3
已知:2x+y=6,x-3y=1,求7y(x-3y)^2-2(3y-x)^2
已知方程组{2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
提公因式:已知2x+y=6 x-3y=1 ,求7y(x-3y)²-2(3y-x)³的值.