7.8乘0.75加上4.27除以1.4简便怎么计算
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7.8×0.75＋4.27÷1.4
=3.9×2×0.75＋4.27×5/7
=3.9×1.5＋0.61×5
=3.9×1.5＋6.1×0.5
=(3.9+6.1)×0.5+3.9×1
=5+3.9=8.9
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7.8×0.75＋4.27÷1.4
=7.8×0.75＋4.27÷7÷0.2
=7.8×0.75＋0.61÷0.2
= 3.9×1.5＋0.61×5
= 3.9×1.5＋6.1×0.5
=(3.9+6.1)×0.5+3.9×1
=5+3.9=8.9
=3.9×2×0.75＋4.27×5/7
=3.9×1.5＋0.61×5
=3.9×1.5＋6.1×0.5
=(3.9+6.1)×0.5+3.9×1
=5+3.9=8.9
------
7.8×0.75＋4.27÷1.4
=7.8×0.75＋4.27÷7÷0.2
=7.8×0.75＋0.61÷0.2
= 3.9×1.5＋0.61×5
= 3.9×1.5＋6.1×0.5
=(3.9+6.1)×0.5+3.9×1
=5+3.9=8.9
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