化简:2(x2y+xy)-3(x2y-xy)-4x2y.
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12
化简求值①化简:4ab+8-2b2-9ab-6②先化简,再求值:已知3x2y-[2x2y-3(2xy-x2y)-xy],
化简求值:2(x2y+xy)-3(x2y-xy)-4x2y,其中x=-1,y=1.
先化简后求值:4x2y-[6xy-3(4xy-2)-x2y]+1,其中x=2,y=-12
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
已知A=x3-2y3+3x2y+xy2-3xy+4,B=y3-x3-4x2y-3xy-3xy2+3,C=y3+x2y+2
先化简,后求值.[2x(x2y-xy2)+xy(xy-x2)]÷x2y,其中x=2013,y=2012.
当x等于2012,y等于2013时,求[3x(x2y-xy2)+xy×(3xy-2x2)]除以x2y的值.题目出完后,小
在2x2y,-2xy2,3x2y,-xy四个代数式中,找出两个同类项,并合并这两个同类项.
计算:[x(x2y2-xy)-y(x2+x3y)]÷3x2y.
计算:[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
分解因式:x2y+2xy+y=______.