0.79×27×7.9×4.9+0.079×240的简便计算
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0.79×27+7.9×4.9+0.079×240
=0.79×27+0.79+49+0.79×24
=0.79×(27+49+24)
=0.79×(76+24)
=0.79×100
=79
=0.79×27+0.79+49+0.79×24
=0.79×(27+49+24)
=0.79×(76+24)
=0.79×100
=79
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