-3(2x²-xy)+4(x²+xy-6)
-3(2x²-xy)+4(x²+xy-6)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
计算 -3(2x²-xy)+4(x²+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
因式分解x²-2xy-3x
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,