3.9×9.9+0.39简便运算五年级
2个回答
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观察数字特点，运用乘法分配律：
3.9×9.9+0.39
=3.9×9.9+3.9×0.1
=3.9×(9.9+0.1)
=3.9×10
=39
3.9×9.9+0.39
=3.9×9.9+3.9×0.1
=3.9×(9.9+0.1)
=3.9×10
=39
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3.9×9.9+0.39
=0.39×(99+1)
=0.39×100
=39
3.9×9.9+0.39
=3.9×9.9+3.9x 0.1
=3.9×(9.9+0.1)
=3.9×10
=39
=0.39×(99+1)
=0.39×100
=39
3.9×9.9+0.39
=3.9×9.9+3.9x 0.1
=3.9×(9.9+0.1)
=3.9×10
=39
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