7.2*58+0.72*42这题如何简便运算十分急
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![7.2*58+0.72*42这题如何简便运算十分急](/uploads/image/z/15470-62-0.jpg?t=7.2%2A58%2B0.72%2A42%E8%BF%99%E9%A2%98%E5%A6%82%E4%BD%95%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E5%8D%81%E5%88%86%E6%80%A5)
7.2*58+0.72*42这题如何简便运算十分急
7.2*58+0.72*42这题如何简便运算
十分急
7.2*58+0.72*42这题如何简便运算十分急
7.2*58+0.72*42
=7.2*58+0.72*(4.2*10)
=7.2*58+(0.72*10)*4.2
=7.2*5.8+7.2*4.2
=7.2*(5.8+4.2)
=7.2*10
=72
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=7.2*58+0.72*(4.2*10)
=7.2*58+(0.72*10)*4.2
=7.2*5.8+7.2*4.2
=7.2*(5.8+4.2)
=7.2*10
=72
7.2*58+0.72*42
=7.2*58+7.2*42*1/10
=7.2(58+42)*1/10
=7.2*100*1/10
=72