问题 解答题
巧解密码我能行.
1
2
X
+
1
3
X
=
1
20

0.5
X
=
3
0.8
   
X:3.25=
1
5
5
4
答案

(1)

1
2
ⅹ+
1
3
ⅹ=
1
20

1
2
+
1
3
)ⅹ=
1
20

5
6
÷
5
6
=
1
20
÷
5
6

x=

1
20
×
6
5

x=

3
50

(2)

0.5
X
=
3
0.8

3ⅹ=0.5×0.8,

3ⅹ÷3=0.4÷3,

x=

2
15
;   

(3)X:3.25=

1
5
5
4

5
4
ⅹ=3.25×
1
5

5
4
ⅹ=
13
20

5
4
x÷
5
4
=
13
20
÷
5
4

x=

13
25

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