解方程. 0.4x=22 3/8+x=2/5 x-1/5x=3/10.
问题描述:
解方程.
0.4x=22
+x=3 8
2 5
x-
x=1 5
. 3 10
答
(1)0.4x=22
0.4x÷0.4=22÷0.4
x=55;
(2)
+x=3 8
2 5
+x-3 8
=3 8
-2 5
3 8
x=
;1 40
(3)x-
x=1 5
3 10
x=4 5
3 10
x×4 5
=5 4
×3 10
5 4
x=
.3 8