化简 3x²+4xy+y²-2xy-3y²+5x²+7;
问题描述:
化简 3x²+4xy+y²-2xy-3y²+5x²+7;
(2)3(—ab+2a)—(3a-b)+3ab
答
3x²+4xy+y²-2xy-3y²+5x²+7
=(3+5)x²+(4-2)xy+(1-3)y²+7
=8x²+2xy-2y²+7
3(—ab+2a)—(3a-b)+3ab
=-3ab+6a-3a+b+3ab
=3a+b1/2x-2(x-1/3y²)+(-2/3x+1/3y²)请化简,会给你分。1/2x-2(x-1/3y²)+(-2/3x+1/3y²)=1/2x-2x+2/3y²-2/3x+1/3y²=-13/6x+y² 如果帮到你,请记得采纳,O(∩_∩)O谢谢