0.8:2.4=5/7比多少?
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2.4×5/7÷0.8
=2.4÷0.8×5/7
=3×5/7
=15/7
所以,
0.8:2.4=5/7:15/7
=2.4÷0.8×5/7
=3×5/7
=15/7
所以,
0.8:2.4=5/7:15/7
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解:解方程,0.8:2.4=5/7比15/7
0.8:2.4=5/7比x
0.8 ÷ 2.4 = 5/7 : x
8/10 ÷ (2×10+4)/10 = 5/7 ÷ x
4/5 ÷ 24/10 = 5/7 ÷ x
4/5 ÷ 12/5 = 5/7 ÷ x
4/5 × 5/12 = 5/7 ÷ x
1/3 = 5/7 ÷ x
x = 5/7 ÷ 1/3
x = 5/7 × 3
∴x = 15/7
答:0.8:2.4=5/7比15/7
0.8:2.4=5/7比x
0.8 ÷ 2.4 = 5/7 : x
8/10 ÷ (2×10+4)/10 = 5/7 ÷ x
4/5 ÷ 24/10 = 5/7 ÷ x
4/5 ÷ 12/5 = 5/7 ÷ x
4/5 × 5/12 = 5/7 ÷ x
1/3 = 5/7 ÷ x
x = 5/7 ÷ 1/3
x = 5/7 × 3
∴x = 15/7
答:0.8:2.4=5/7比15/7
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