3.12乘31.2乘9.9运用简便方法怎么运算
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3.12乘31.2乘9.9运用简便方法怎么运算
![3.12乘31.2乘9.9运用简便方法怎么运算](/uploads/image/z/5121857-65-7.jpg?t=3.12%E4%B9%9831.2%E4%B9%989.9%E8%BF%90%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E6%80%8E%E4%B9%88%E8%BF%90%E7%AE%97)
3.12+31.2×9.9
=3.12+3.12×10×9.9
=3.12+3.12×99
=3.12×(1+99)
=3.12×100
=312
=3.12+3.12×10×9.9
=3.12+3.12×99
=3.12×(1+99)
=3.12×100
=312