作业帮1.(-x+2x²+5)+(4x²-3-6x) 2.(3a²-ab+7)-(-4a²+2ab+7) 3.(2a-3b)- [4a+（3a-b] 怎么计算
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![1.(-x+2x²+5)+(4x²-3-6x) 2.(3a²-ab+7)-(-4a²+2ab+7) 3.(2a-3b)- [4a+（3a-b] 怎么计算](/uploads/image/z/988180-52-0.jpg?t=1.%28-x%2B2x%26%23178%3B%2B5%29%2B%284x%26%23178%3B-3-6x%29+2.%283a%26%23178%3B-ab%2B7%29-%28-4a%26%23178%3B%2B2ab%2B7%29+3.%282a-3b%29-+%5B4a%2B%EF%BC%883a-b%5D+%E6%80%8E%E4%B9%88%E8%AE%A1%E7%AE%97)
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1.(-x+2x²+5)+(4x²-3-6x) 2.(3a²-ab+7)-(-4a²+2ab+7) 3.(2a-3b)- [4a+（3a-b] 怎么计算
1.(-x+2x²+5)+(4x²-3-6x) 2.(3a²-ab+7)-(-4a²+2ab+7) 3.(2a-3b)- [4a+（3a-b]
怎么计算
1.(-x+2x²+5)+(4x²-3-6x) 2.(3a²-ab+7)-(-4a²+2ab+7) 3.(2a-3b)- [4a+（3a-b] 怎么计算
1.(-x+2x²+5)+(4x²-3-6x)
=-x+2x²+5+4x²-3-6x
=6x²-7x+2
2.(3a²-ab+7)-(-4a²+2ab+7)
=3a²-ab+7+4a²-2ab-7
=7a²-3ab
3.(2a-3b)- [4a+（3a-b]
=2a-3b-4a-（3a-b)
=-2a-3b-3a+b
=-5a-2b
这是什么题目呀 不就是合并同类项啊