5.8*7.9+42*0.79怎么简算?

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5.8*7.9+42*0.79怎么简算?

5.8*7.9+42*0.79怎么简算?
5.8*7.9+42*0.79怎么简算?

5.8*7.9+42*0.79怎么简算?
5.8*7.9+42*0.79
=5.8*7.9+4.2*7.9
=7.9*(5.8+4.2)
=7.9*10
=79

=58*0.79+42*0.79
=(58+42)*0.79
=79

5.8*7.9+42*0.79
=0.79*10*5.8+42*0.79
=0.79*(10*5.8+42)
=0.79*(58+42)
=0.79*100
=79
希望对你有帮助

5.8*7.9+4.2*7.9=(5.8+4.2)*7.9=10*7.9=79