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展开全部
3.9x9.1+0.39
=3.9x(9.1+0.1)
=3.9x9.2
=3.9Ⅹ(10-0.8)
=39-3.12
=35.88
=3.9x(9.1+0.1)
=3.9x9.2
=3.9Ⅹ(10-0.8)
=39-3.12
=35.88
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展开全部
3.9*9.1+0.39
=3.9*9.1+0.39*10*0.1
=3.9*9.1+3.9*0.1
=3.9*(9.1+0.1)
=3.9*9.2
=35.88
=3.9*9.1+0.39*10*0.1
=3.9*9.1+3.9*0.1
=3.9*(9.1+0.1)
=3.9*9.2
=35.88
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展开全部
=0.39×91+0.39=0.39×90+0.39×2=34.32
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展开全部
3.9×9.1+0.39
=0.39×91+0.39
=0.39×(91+1)
=35.88
=0.39×91+0.39
=0.39×(91+1)
=35.88
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评论
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