(-x+2x²+5)+(4x²-3-6x)等于多少还有(3a²-ab+7)-(-4a²+2ab+7)

(-x+2x²+5)+(4x²-3-6x)等于多少还有(3a²-ab+7)-(-4a²+2ab+7)
(-x+2x²+5)+(4x²-3-6x)等于多少
还有(3a²-ab+7)-(-4a²+2ab+7)

(-x+2x²+5)+(4x²-3-6x)等于多少还有(3a²-ab+7)-(-4a²+2ab+7)
(-x+2x²+5)+(4x²-3-6x)等于多少
=-x+2x²+5+4x²-3-6x
=6x²-7x+2;
问题补充：
还有(3a²-ab+7)-(-4a²+2ab+7)
=3a²-ab+7+4a²-2ab-7
=7a²-3ab;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,

(-x+2x²+5)+(4x²-3-6x)
=-x+2x²+5+4x²-3-6x
=6x²-7x+2
(3a²-ab+7)-(-4a²+2ab+7)
=3a²-ab+7+4a²-2ab-7
=7a²-3ab

(-x+2x²+5)+(4x²-3-6x)等于多少
= -x+2x²+5+4x²-3-6x
= 2+6x²-7x
(3a²-ab+7)-(-4a²+2ab+7)
= 3a²-ab+7+4a²-2ab-7
= 7a²-3ab

1. 原式=-x+2x^2+5+4x^2-3-6x=6x^2-7x+2

2. 原式=3a^2-ab+7+4a^2-2ab-7=7a^2-3ab