题目内容

求未知数x的值:
(1)1.3x+0.9x-3=0.3
(2)
1
13
4
5
=
10
13

(3)
0.75
1.5
=
x
8

(4)0.6:3.6=
4
5
:x.
(1)1.3x+0.9x-3=0.3,
2.2x-3=0.3,
2.2x-3+3=0.3+3,
2.2x=3.3
2.2x÷2.2=3.3÷2.2,
x=1.5;

(2)
1
13
4
5
=
10
13

1
13
4
5
×
4
5
=
10
13
×
4
5

1
13
x=
8
13

1
13
1
13
=
8
13
÷
1
13

x=8;

(3)
0.75
1.5
=
x
8

0.75
1.5
×8
=
x
8
×8

x=
0.75
1.5
×8

x=4;

(4)0.6:3.6=
4
5
:x,
0.6x=3.6×
4
5

0.6x=2.88,
0.6x÷0.6=2.88÷0.6,
x=4.8.
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