2.9×2.9-2.9+29×0.81

2026年09月26日 02:39
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解:2.9×2.9-2.9+29×0.81
=2.9×2.9-2.9×1+2.9×10×0.81
=2.9×(2.9-1+10×0.81)
=2.9×(2.9-1+8.1)
=2.9×10
=29