化简求值:2(x2y+xy)-3(x2y-xy)-4x2y,其中x=-1,y=1.
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
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12
先化简,再求值(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
先化简,后求值.[2x(x2y-xy2)+xy(xy-x2)]÷x2y,其中x=2013,y=2012.
化简求值:[x(x2y2-xy)-y(x2-x3y)]÷3x2y,其中x=3,y=-1.
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],
(2x2y-2xy2)-[(-3x2y2+3x2y)+(3x2y2-3xy2)],其中x=-1,y=2.
若x+y=2,xy=-4,求x2y+xy2+1的值
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
已知x,y,z满足(1)已知|x-2|+(y+3)2=0(2)z是最大的负整数化简求值2(x2y+xyz)-3(x2y-
化简并求值:(2x2y-2xy2)-[(-3x2y2+3x2y)+(3x2y2-3xy2)],其中x=−12,y=2