问题 解答题
求未知数x
(1)4x-4×
1
2
=18
(2)
36
x
=
54
3
(3)3x+x+6=26(4)
1
5
1
2
=
1
0.25
:x.
答案

(1)4x-4×

1
2
=18,

4x-2=18,

4x-2+2=18+2,

4x=20,

4x÷4=20÷4,

x=5;

(2)

36
x
=
54
3

54x=36×3,

54x=108,

54x÷54=108÷54,

x=2;

(3)3x+x+6=26,

4x+6=26,

4x+6-6=26-6,

4x=20,

4x÷4=20÷4,

x=5;

(4)

1
5
1
2
=
1
0.25
:x,

1
5
x=
1
2
×
1
0.25

1
5
x=2,

1
5
1
5
=2÷
1
5

x=10.

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