解方程. 9x-4x=6.5; 1/4+x=1/2; y-2/5=3/4; m+3/5=7/10.
问题描述:
解方程.
9x-4x=6.5;
+x=1 4
; y-1 2
=2 5
; m+3 4
=3 5
.7 10
答
(1)9x-4x=6.5
5x=6.5
5x÷5=6.5÷5
x=1.3;
(2)
+x=1 4
1 2
+x-1 4
=1 4
-1 2
1 4
x=
;1 4
(3)y-
=2 5
3 4
y-
+2 5
=2 5
+3 4
2 5
y=
;23 20
(4)m+
=3 5
7 10
m+
-3 5
=3 5
-7 10
3 5
m=
.1 10