2.1×0.5÷4.2 这道题的简算 99×3/9 - 知识问答

2.1×0.5÷4.2 这道题的简算 99×3/98（/为分号）这道题的简算

1个回答

2.1×0.5÷4.2
=2.1÷4.2×0.5
=0.5×0.5
=0.25
99×3/98
=(98+1)×3/98
=98×3/98+1×3/98
=3+3/98
=3又3/98

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