1/2(3xy+2x²)-3(x²-1/2xy)化简 并求值
1个回答
1/2(3xy+2x²)-3(x²-1/2xy)
=3/2xy+x²-3x²+3/2xy
=3xy-2x²
相关问题
化简、求值(1)化简:3(x-2y)+2(3x+y)(2)先化简再求值(3x²y-2xy²)-(xy
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
化简求值:[2x^2y^2-(xy+3)(xy-3)-9]/xy,其中x=2,y=-1/3
化简求值:¼xy²+(2x²y-1)-(½xy²+3/2x²
化简求值:3(x2+xy)-2(x3-y3-3xy)+(-3xy-2y3),其中x=1,y=2
先化简,再求值:2xy-3([1/3]xy+x2)+3x2.其中x=-2,y=[1/2].
(1)先化简再求值:3x2y-[2xy2-2(xy-1.5x2y)+xy]+3xy2,其中x=-3,y=-2;
先化简再求值:3x2y-[2xy2-4([1/2]xy-[3/4]x2y)+xy]+3xy2,其中x=3,y=-1.
先化简,再求值:3xy-(-2xy)+(-7xy),其中x=-2, y=-1 1 2 .
先化简再求值:(3x^2-xy^2)-3(x^2y-2xy^2),其中x=1/2,y=-1/3