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Using 3 / 1, 5 / 2, 25 and 30 as the four items of proportion, how many different ratios can you form? Please write down these ratios
25:5 / 2 = 30:3 / 1 (ratio = 10)
25: 30 = 5 / 2: 3 / 1 (ratio = 5 / 6)
5 / 2: 25 = 3 / 1: 30 (ratio = 1 / 10)
30: 25 = 3 / 1: 5 / 2 (ratio = 6 / 5)
25,2,3 / 4 with a number, the composition ratio is
1.25:2=3/4:x
x=1.2
Add another number to form a ratio with 1.25, 0.8 and 2 / 5. Please write a ratio
1.25×0.8=1,1÷2/5=2.5
1.25：2/5=2.5：0.8
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