5.8×13.1-3.1×0.9
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回答:
5.8×13.1-3.1×0.9
=5.8×(10+3.1)-3.1×0.9
=58+5.8×3.1-3.1×0.9
=58+3.1×(5.8-0.9)
=58+3.1×4.9
=58+3.1×(5-0.1)
=58+15.5-0.31
=73.5-0.31
=73.19
5.8×13.1-3.1×0.9
=5.8×(10+3.1)-3.1×0.9
=58+5.8×3.1-3.1×0.9
=58+3.1×(5.8-0.9)
=58+3.1×4.9
=58+3.1×(5-0.1)
=58+15.5-0.31
=73.5-0.31
=73.19
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展开全部
5.8×13.1-3.1×0.9
=5.8×(10+3.1)-3.1×0.9
=5.8×10+5.8×3.1-3.1×0.9
=58+3.1×(5.8-0.9)
=58+3.1×4.9
=73.19
=5.8×(10+3.1)-3.1×0.9
=5.8×10+5.8×3.1-3.1×0.9
=58+3.1×(5.8-0.9)
=58+3.1×4.9
=73.19
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