问题
解答题
求未知数X.
|
答案
(1)x-20%x=7.2,
80%x=7.2,
80%x÷80%=7.2÷80%,
x=9;
(2)42:
=x:3 5
,5 7
x=42×3 5
,5 7
x÷3 5
=30÷3 5
,3 5
x=50.
求未知数X.
|
(1)x-20%x=7.2,
80%x=7.2,
80%x÷80%=7.2÷80%,
x=9;
(2)42:
=x:3 5
,5 7
x=42×3 5
,5 7
x÷3 5
=30÷3 5
,3 5
x=50.