问题
解答题
解方程. ①x÷(1-
②
|
答案
(1)x÷(1-
-25%)=21 9
,1 2
x÷
=223 36
,1 2
x÷
×23 36
=23 36
×5 2
,23 36
x=1
;43 72
(2)
=1.75÷2,0.75 x
=0.875,0.75 x
×x=0.875x,0.75 x
0.875x=0.75,
0.875x÷0.875=0.75÷0.875,
x=
.6 7