Question

（1）4x²y-8xy²+7-4x²y+12xy²-4 合并同类项 要过程

（2）a²-2ab+b²+2a²+2ab-b²

Answer 1

4x²y-8xy²+7-4x²y+12xy²-4
=4x²y-4x²y+12xy²-8xy²-4+7
=4xy²+3

a²-2ab+b²+2a²+2ab-b²
=a²+2a²+2ab-2ab-b²+b²
=3a²

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Answer 2

1）4x²y-8xy²+7-4x²y+12xy²-4
=（4x²y-4x²y）+（12xy²-8xy²）+（7-4）
=4xy²+3
2）a²-2ab+b²+2a²+2ab-b²
=（a²+2a²）+（2ab-2ab）+（b²-b²）
=3a²

Answer 3

4x²y-8xy²+7-4x²y+12xy²-4
=4x²y-4x²y-8xy²+12xy²+7-4
=4xy²+3

a²-2ab+b²+2a²+2ab-b²
=a²+2a²+b²-b²+2ab-2ab
=3a²

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