问题 解答题
求未知数X的值:
0.75X-5×
1
2
=1.5;
4
5
:X=4
1
2
:10.
答案

(1)0.75X-5×

1
2
=1.5,

0.75X-2.5+2.5=1.5+2.5,

0.75x=4,

0.75x÷0.75=4÷0.75,

x=5

1
3

(2)

4
5
:X=4
1
2
:10,

4

1
2
x=
4
5
×
10,

4

1
2
x÷4
1
2
=8÷4
1
2

x=1

7
9

单项选择题 A1/A2型题
单项选择题