化简:-3{y-(3x^2-3xy)}-{y+2(4x^2-4xy)}
1个回答
-3{y-(3x^2-3xy)}-{y+2(4x^2-4xy)}
=-3{y-3x^2+3xy}-{y+8x^2-8xy}
=-3y+9x^2-9xy-y-8x^2+8xy
=x^2-xy-4y
相关问题
化简: 4xy²-3x²y-{3x²y+xy²-[2xy²-(4x
5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y(化简)
化简 3x²+4xy+y²-2xy-3y²+5x²+7;
先化简再求值:3x2y-[2xy2-4([1/2]xy-[3/4]x2y)+xy]+3xy2,其中x=3,y=-1.
化简 (-3/2x²y)²(2x²-4xy+7y²) (-4x-3y²
化简-12xy^2*1/3x^3y^4-x(2xy^2)^3
化简求值:[(3x^2y^2+4)-(xy+2)(2-xy)]/(-4xy),其中x=-2,y=
先化简,再求值:(-3xy)2(x2+xy-y2)-3x2y2(3x2+3xy+y2),其中x=-[4/3],y=-[3
(-3xy-7y)+[4x-3(xy+y-2x)],其中xy=-2,x-y=3,先化简,再求值.
先化简,再求值:(3x﹣3y+5xy)﹣(2x﹣4y﹣3xy),其中x+y=﹣3,xy=﹣4.