作业帮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
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