问题
解答题
解方程.
|
答案
(1)x-
=7 8
,7 8
x-
+7 8
=7 8
+7 8
,7 8
x=
;7 4
(2)
+x=2 5
,3 2
+x-2 5
=2 5
-3 2
,2 5
x=
;11 10
(3)3x=4,
3x÷3=4÷3,
x=
;4 3
(4)x÷0.4=0.16,
x÷0.4×0.4=0.16×0.4,
x=0.064.
解方程.
|
(1)x-
=7 8
,7 8
x-
+7 8
=7 8
+7 8
,7 8
x=
;7 4
(2)
+x=2 5
,3 2
+x-2 5
=2 5
-3 2
,2 5
x=
;11 10
(3)3x=4,
3x÷3=4÷3,
x=
;4 3
(4)x÷0.4=0.16,
x÷0.4×0.4=0.16×0.4,
x=0.064.