39*7.7+3.9*23简便运算
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39*7.7+3.9*23简便运算
原式=3.9*10*7.7+3.9*23
=3.9*77+3.9*23
=3.9*(77+23)
=3.9*100
=390
=3.9×77+3.9×23
=3.9×(77+23)
=3.9×100
=39
原式=3.9×77+3.9×23
=3.9×(77+23)
=3.9×100
=390
39*7.7+3.9*23
=3.9*77+3.9*23
=3.9*(77+23)
=3.9*100
=390