2.31×0.78-1.37×78/10简便方法
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2.31×0.78-1.37×78/10简便方法
![2.31×0.78-1.37×78/10简便方法](/uploads/image/z/20040683-59-3.jpg?t=2.31%C3%970.78-1.37%C3%9778%2F10%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
2.31×0.78-1.37×78/10
=0.231×7.8-1.37×7.8
=(0.231-1.37)×7.8
=-1.039×7.8
=-7.8-0.04×7.8+0.0078
=-7.8-0.312+0.0078
=-8.1042
=0.231×7.8-1.37×7.8
=(0.231-1.37)×7.8
=-1.039×7.8
=-7.8-0.04×7.8+0.0078
=-7.8-0.312+0.0078
=-8.1042