7.2*58+0.72*42这题如何简便运算

十分急
2024-12-03 07:31:48
推荐回答(4个)
回答1:

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

回答2:

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回答3:

=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

回答4:

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