这几题能用简便方法计算吗
1个回答
2017-10-28
展开全部
10.5÷(10.5÷2.1)
=10.5÷10.5×2.1
=2.1,
————
2.7÷1.2+2.7÷1.5
=2.7×5/6+2.7×2/3
=2.7×(5/6+2/3)
=2.7×9/6
=2.7×3/2
=4.05,
————
4.05÷0.81+1.25
=5+1.25
=6.25
=10.5÷10.5×2.1
=2.1,
————
2.7÷1.2+2.7÷1.5
=2.7×5/6+2.7×2/3
=2.7×(5/6+2/3)
=2.7×9/6
=2.7×3/2
=4.05,
————
4.05÷0.81+1.25
=5+1.25
=6.25
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