先化简比再求比值:(1)42:28(2)0.5:0.15(3) 7 8 :
先化简比再求比值:(1)42:28(2)0.5:0.15(3)78:56(4)23小时:40分....
先化简比再求比值:(1)42:28(2)0.5:0.15(3) 7 8 : 5 6 (4) 2 3 小时:40分.
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(1)42:28, =(42÷14):(28÷14), =3:2; 42:28, =3:2, =3÷2, =
(2)0.5:0.15, =(0.5×20):(0.15×20), =10:3; 0.5:0.15, =10:3, =10÷3, =
(3)
=(
=21:20;
=21:20, =21÷20, =
(4)
=40分:40分, =1:1;
=1:1, =1÷1, =1. |
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