问题
解答题
求未知数x. ①x-
②
|
答案
x-
+1 3
=2 3
,3 4
x-
+1 3
-2 3
=2 3
+3 4
,2 3
x-
=1 3
,17 12
x=
+17 12
,1 3
x=1
;3 4
(2)
=1.2 7.5
,0.4 x
1.2x=0.4×7.5,
1.2x=3,
1.2x÷1.2=3÷1.2
x=2.5.
求未知数x. ①x-
②
|
x-
+1 3
=2 3
,3 4
x-
+1 3
-2 3
=2 3
+3 4
,2 3
x-
=1 3
,17 12
x=
+17 12
,1 3
x=1
;3 4
(2)
=1.2 7.5
,0.4 x
1.2x=0.4×7.5,
1.2x=3,
1.2x÷1.2=3÷1.2
x=2.5.