5:7=4:()?
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解:5:7 = 4:(28/5),【或5:7 = 4:(5.6) 】
∵已知5:7 = 4:一个数
需求出这个数
A : B = A ÷ B = A / B = C
∴设这个数为x
5 :7 = 4 :x
5 ÷ 7 = 4 ÷ x
5 × 1/7 = 4 ÷ x
5/7 = 4 ÷ x
x = 4 ÷ 5/7
x = 4 × 7/5
x = 28/5
∴x = 5.6
答:5:7 = 4:(28/5),【或5:7 = 4:(5.6) 】
∵已知5:7 = 4:一个数
需求出这个数
A : B = A ÷ B = A / B = C
∴设这个数为x
5 :7 = 4 :x
5 ÷ 7 = 4 ÷ x
5 × 1/7 = 4 ÷ x
5/7 = 4 ÷ x
x = 4 ÷ 5/7
x = 4 × 7/5
x = 28/5
∴x = 5.6
答:5:7 = 4:(28/5),【或5:7 = 4:(5.6) 】
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