3x²y²-[5xy²-(4xy²-3)+2x²y²]等于多
3x²y²-[5xy²-(4xy²-3)+2x²y²]等于多
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
3xy+xy+2x²y+yx²+3x²y等于多少
3y/2x+2y + 2xy/x²+xy等于多少过程
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
已知x/y等于3,求x²+2xy-3y²/x²-xy+y²的值
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(xy-x²)×x-y/xy
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
若y分之x等于3分之4,求2x²+3xy-5y²分之3x²-5xy+2y²的值
已知y分之x等于3分之4 求2x²+3xy-5y²分之3x²-5xy+2y²的值