问题 解答题
求未知数X:
3.5
1.4
=
x
0.2
1
3
+
1
2
x=0.5
0.36×5-0.75x=0.6.
答案

(1)

3.5
1.4
=
x
0.2

1.4x=3.5×0.2,

1.4x÷1.4=0.7÷1.4,

x=0.5;

(2)

1
3
+
1
2
x=0.5,

1
3
+
1
2
x-
1
3
=0.5-
1
3

1
2
x×2=
1
6
×2,

x=

1
3

(3)0.36×5-0.75x=0.6,

1.8-0.75x=0.6,

1.8-0.75x+0.75x=0.6+0.75x,

0.6+0.75x-0.6=1.8-0.6,

0.75x÷0.75=1.2÷0.75,

x=1.6.

单项选择题
单项选择题