先化简成最简整数比,再求比值. 1.5:2.1 14:35 58
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先化简成最简整数比,再求比值.
1.5:2.1 | 14:35 |
(1)1.5:2.1,
=(1.5×10÷3):(2.1×10÷3), =5:7; 1.5:2.1, =5:7, =5÷7, = 5 7. (2)14:35, =(14÷7):(35÷7), =2:5; 14:35, =2:5, =2÷5, = 2 5. (3) 5 8: 5 6, =( 5 8×24):( 5 6×24), =15:20, =3:4; 5 8: 5 6, =3:4, =3÷4, = 3 4. (4)6千米:300米, =6000米:300米, =(6000÷300):(300÷300), =20:1; 6千米:300米, =20:1, =20÷1, =20. (5)5小时:1小时40分, =300分:100分, =(300÷100):(100÷100), =3:1; 5小时:1小时40分, =3:1, =3÷1, =3. |