化简比并求比值.(1)12:30 (2)0.4:3.2 (3)23
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化简比并求比值. (1)12:30 | (2)0.4:3.2 | (3)
(1)12:30, =(12÷6):(30÷6), =2:5; 12:30, =2:5, 2÷5, = 2 5. (2)0.4:3.2, =(0.4×5):(3.2×5), =2:16, =1:8; 0.4:3.2, =1:8, =1÷8, = 1 8. (3) 2 3: 5 18, =( 2 3×18):( 5 18×18), =12:5;
2 3: 5 18, =12:5, =12÷5, = 12 5.
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