问题
解答题
求未知数x. 0.4:0.25=
|
答案
(1)因为0.4:0.25=
,12 x
则0.4:0.25=12:x,
0.4x=12×0.25,
0.4x=3,
x=7.5;
(2)
×1 2
+75%x=1 3
,1 4
+1 6
x=3 4
,1 4
2+9x=3,
9x=1,
x=
;1 9
求未知数x. 0.4:0.25=
|
(1)因为0.4:0.25=
,12 x
则0.4:0.25=12:x,
0.4x=12×0.25,
0.4x=3,
x=7.5;
(2)
×1 2
+75%x=1 3
,1 4
+1 6
x=3 4
,1 4
2+9x=3,
9x=1,
x=
;1 9