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1.4a²-2(ab-3a²)+3 2.3x²-【7x-(4x+2)+2x²】-x²
谢谢.拜托
人气:442 ℃ 时间:2019-11-09 13:09:31
解答
1.4a²-2(ab-3a²)+3
=4a²-2ab+6a²+3
=10a²-2ab+3
2.3x²-【7x-(4x+2)+2x²】-x²
=3x²-7x+4x+2-2x²-x²
=-3x+2
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