化简 3x²+4xy+y²-2xy-3y²+5x²+7;
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/16 14:14:17
化简 3x²+4xy+y²-2xy-3y²+5x²+7;
(2)3(—ab+2a)—(3a-b)+3ab
(2)3(—ab+2a)—(3a-b)+3ab
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+b
再问: 1/2x-2(x-1/3y²)+(-2/3x+1/3y²)请化简,会给你分。
再答: 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
=(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+b
再问: 1/2x-2(x-1/3y²)+(-2/3x+1/3y²)请化简,会给你分。
再答: 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
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简 3x²+4xy+y²-2xy-3y²+5x²+7;
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简-3x²y+2x²y+3xy²-2xy²
若x²+y²=7,xy=-2,求5x²-3xy-4y²-11xy-7x²
-4x²y-8xy²+2x²y-3xy²
1.已知x²+y²+7 xy+-2求5x²-3xy-4y²-11xy-7x