问题
解答题
解方程. ①1-
②0.4:0.25=
|
答案
(1)1-
X=1 4
,1 4
1-
X+1 4
X=1 4
+1 4
X1 4
+1 4
X=1,1 4
+1 4
X-1 4
=1-1 4
,1 4
X=1 4
,3 4
X÷1 4
=1 4
÷3 4
,1 4
X=3;
(2)0.4:0.25=
,12 X
0.4X=0.25×12,
0.4X=3,
0.4X÷0.4=3÷0.4,
X=7.5.