问题
解答题
解方程. 5X-3×
5-
2X+40%X=7.2 5×(X-
|
答案
(1)5X-3×
=10 7
,7 5
5X-
=30 7
,7 5
5X-
+30 7
=30 7
+7 5
,30 7
5X÷5=
÷5,199 35
X=1
;24 175
(2)5-
X=2 3
,1 3
5-
X+2 3
X=2 3
+1 3
X,2 3
5-
=1 3
+1 3
X-2 3
,1 3
4
×2 3
=3 2
X×2 3
,3 2
X=7;
(3)2X+40%X=7.2,
2.4X=7.2,
2.4X÷2.4=7.2÷2.4,
X=3;
(4)5×(X-
)=2,1 3
5×(X-
)÷5=2÷5,1 3
X-
+1 3
=1 3
+2 5
,1 3
X=
.11 15