计算2x•(-3xy)2•(-x2y)3的结果是______.
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12
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______.
先化简后求值:4x2y-[6xy-3(4xy-2)-x2y]+1,其中x=2,y=-12
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:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
单项式-3x2减去单项式-4x2y,-5x2,2x2y的和,列算式为______,化简后的结果是______.
如果2x+y=4,xy=3,那么2x2y+xy2的值为______.
计算:[x(x2y2-xy)-y(x2+x3y)]÷3x2y.
计算:[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
多项式x2y-2xy+3的是______次______项式,二次项的系数是______.
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.