计算:[2x(x2y-xy2)+xy(xy-x2)]÷x2y.
先化简,后求值.[2x(x2y-xy2)+xy(xy-x2)]÷x2y,其中x=2013,y=2012.
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
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
计算:[x(x2y2-xy)-y(x2+x3y)]÷3x2y.
计算:[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
计算(3xy2-6x2y)÷(-2x)= ___ .
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12
若x2y+xy2=30,xy=6,求下列代数式的值:(1)x2+y2;(2)x-y.
化简求值:2(x2y+xy)-3(x2y-xy)-4x2y,其中x=-1,y=1.
若x-y=3,xy=-2,则xy2-x2y的值是______.
当x+y=5 xy=6 (x2y)(xy2)=?