问题
解答题
|
答案
(1)x-
=7 9
,7 9
x-
+7 9
=7 9
+7 9
,7 9
x=1
;5 9
(2)
+x=5 7
,3 2
+x-5 7
=5 7
-3 2
,5 7
x=
;11 14
(3)5x=7,
5x÷5=7÷5,
x=1.4;
(4)x÷0.5=0.78,
x÷0.5×0.5=0.78×0.5,
x=0.39.
|
(1)x-
=7 9
,7 9
x-
+7 9
=7 9
+7 9
,7 9
x=1
;5 9
(2)
+x=5 7
,3 2
+x-5 7
=5 7
-3 2
,5 7
x=
;11 14
(3)5x=7,
5x÷5=7÷5,
x=1.4;
(4)x÷0.5=0.78,
x÷0.5×0.5=0.78×0.5,
x=0.39.