问题
解答题
|
答案
(1)75:0.45,
=(75×20):(0.45×20),
=1500:9,
=500:3;
(2)
:1 3
,7 18
=(
×18):(1 3
×18),7 18
=6:7;
(3)2.1:
,3 7
=(
×70):(21 10
×70),3 7
=147:30,
=(147÷3):(30÷3),
=49:10.
|
(1)75:0.45,
=(75×20):(0.45×20),
=1500:9,
=500:3;
(2)
:1 3
,7 18
=(
×18):(1 3
×18),7 18
=6:7;
(3)2.1:
,3 7
=(
×70):(21 10
×70),3 7
=147:30,
=(147÷3):(30÷3),
=49:10.