7.8-7.2*0.9怎样简便运算
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7.8-7.2*0.9怎样简便运算
7.8-7.2*0.9怎样简便运算
7.8-7.2*0.9怎样简便运算
7.8-7.2*0.9
=7.2+0.6-7.2*0.9
=7.2*(1-0.9)+0.6
=7.2*0.1+0.6
=0.72+0.6
=1.32
7.8-7.2+0.72
7.8-7.2×0.9
=7.8-7.2×(1-0.1)
=7.8-7.2+0.72
=0.6+0.72
=1.32