问题 解答题
求Χ的值.
2
5
×(9-Χ)=
2
5
Χ:
4
5
=80:16
3
4
χ+
5
6
χ-6=
1
3
答案

(1)

2
5
×(9-X)=
2
5

2
5
×(9-X)÷
2
5
=
2
5
÷
2
5

9-X=1,

9-X+X=1+X,

1+X=9,

1+X-1=9-1,

X=8;

(2)X:

4
5
=80:16,

16X=

4
5
×80,

16X=64,

16X÷16=64÷16,

X=4;

(3)

3
4
x+
5
6
x-6=
1
3

3
4
+
5
6
)x-6+6=
1
3
+6,

19
12
x=
19
3

19
12
19
12
=
19
3
÷
19
12

x=

19
3
×
12
19

x=4.

阅读理解与欣赏
问答题