12÷(3/5+4/7)有简便算法吗?
2个回答
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解:12÷(3/5+4/7)等于( 420/41 ),【即约等于10.24】
∵已知需求出12÷(3/5+4/7)等于多少
∴12 ÷ (3/5 + 4/7)
= 12 ÷ [(3×7)/(5×7)+(4×5)/(7×5)]
= 12 ÷ (21/35 + 20/35)
= 12 ÷ 41/35
= 12 × 35/41
= 420/41
= 10.24390244
≈ 10.24
答:12÷(3/5+4/7)等于420/41,【即约等于10.24】
∵已知需求出12÷(3/5+4/7)等于多少
∴12 ÷ (3/5 + 4/7)
= 12 ÷ [(3×7)/(5×7)+(4×5)/(7×5)]
= 12 ÷ (21/35 + 20/35)
= 12 ÷ 41/35
= 12 × 35/41
= 420/41
= 10.24390244
≈ 10.24
答:12÷(3/5+4/7)等于420/41,【即约等于10.24】
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