7.2-7.2*0.36-0.72*6.3巧算
2个回答
0.72*6.3 =7.2*0.63
所以原式 = 7.2-7.2*0.36-7.2*0.63
=7.2*(1-0.36-0.63)
=0.072
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怎样算简便就怎样算.6.45+1.36-6.45+7.64 2.7×(100+2) 9.64-7.3-0.7 4.63÷