化简 2(2a²+9b)+(-3a²-4b)化简 2(2a²+9b)+(-3a²-4b)
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化简 2(2a²+9b)+(-3a²-4b)化简 2(2a²+9b)+(-3a²-4b)
化简 2(2a²+9b)+(-3a²-4b)
化简 2(2a²+9b)+(-3a²-4b)
化简 2(2a²+9b)+(-3a²-4b)化简 2(2a²+9b)+(-3a²-4b)
=4a²+18b-3a²-4b
=a²+14b
2(2a²+9b)+(-3a²-4b)
=4a²+18b-3a²-4b
=﹙4a²-3a²﹚+﹙18b-4b﹚
=a²+14b.合并同类项
3ab²b+2ab²-5-3a²b-5ab²+2原式=﹙...
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2(2a²+9b)+(-3a²-4b)
=4a²+18b-3a²-4b
=﹙4a²-3a²﹚+﹙18b-4b﹚
=a²+14b.
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2(2a²+9b)+(-3a²-4b)
=4a²+18b-3a²-4b
=a²+14b