问题 解答题
求未知数x.
4x+3×0.7=6.5
1
2
1
5
=
1
4
:x
1.5
x
=
3.6
1.8
答案

(1)4x+3×0.7=6.5,

4x+2.1-2.1=6.5-2.1,

4x=4.4,

4x÷4=4.4÷4,

x=1.1;

(2)

1
2
1
5
=
1
4
:x,

1
2
x=
1
5
×
1
4

1
2
x÷
1
2
=
1
20
÷
1
2

x=

1
10

(3)

1.5
x
=
3.6
1.8

3.6x=1.5×1.8,

3.6x=2.7,

3.6x÷3.6=2.7÷3.6,

x=

3
4

单项选择题
单项选择题