题目内容

求未知数x.
(1)
1
3
1
20
=
5
9
:x
(2)
3
4
-5x=0.75.
(1)
1
3
1
20
=
5
9
:x,
1
3
x=
1
20
×
5
9

1
3
x÷
1
3
=
1
36
÷
1
3

x=
1
12


(2)
3
4
-5x=0.75,
3
4
-5x+5x=0.75+5x,
3
4
=0.75+5x,
3
4
-0.75=0.75+5x-0.75,
0=5x,
x=0.
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