计算:3xy-4xy-(-2xy)
3xy-3xy-xy+2yx
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
计算:12xy+(3x2-5xy)-2(3xy+2x2).
1、计算:-3(2X^2-XY)+4(X^2+XY-6)
计算 -3(2x²-xy)+4(x²+xy-6)
3(xy-xy)-2(xy+xy)+3xy
-3(2x^2-xy)+4(x^2+xy-6)
(-3x^y+2xy)-( )=4x^+xy