简便方法计算 81.2*5.3-62.4*1.1
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简便方法计算 81.2*5.3-62.4*1.1
简便方法计算 81.2*5.3-62.4*1.1
简便方法计算 81.2*5.3-62.4*1.1
用加法结合律:
81.2*(5+0.3)-(62.4*(1+0.1))
=81.2*5+81.2*0.3-(62.4*1+62.4*0.1)
=406+24.36-(62.4+6.24)
=430.36-68.64
=361.72