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解方程或比例.①548x-2=0.5②x8.1=410.8③X:12=74:2.8.

题目详情
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
解方程或比例.
5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.

5
48
x-2=0.5     
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
5
48
5 48 5 5 48 48
x
8.1
=
4
10.8

③X:12=
7
4
:2.8.
x
8.1
x 8.1 x x 8.1 8.1
4
10.8

③X:12=
7
4
:2.8.
4
10.8
4 10.8 4 4 10.8 10.8
7
4
:2.8.
7
4
7 4 7 7 4 4
▼优质解答
答案和解析
(1)
5
48
x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
(1)
5
48
x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
(1)
5
48
x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
(1)
5
48
x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
(1)
5
48
x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
5
48
5 48 5 5 5 48 48 48 x -2=0.5,
5
48
x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
5
48
5 48 5 5 5 48 48 48 x-2+2=0.5+2 ,
5
48
48
5
=2.5×
48
5

x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
5
48
5 48 5 5 5 48 48 48 x×
48
5
48 5 48 48 48 5 5 5 =2.5×
48
5
48 5 48 48 48 5 5 5 ,
x=24;

(2)
x
8.1
=
4
10.8

10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
x
8.1
x 8.1 x x x 8.1 8.1 8.1 =
4
10.8
4 10.8 4 4 4 10.8 10.8 10.8 ,
10.8x=8.1×4,
10.8x÷10.8=32.4÷10.8,
x=3;

(3) x:12=
7
4
:2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
x:12=
7
4
7 4 7 7 7 4 4 4 :2.8 ,
2.8x=12×
7
4

2.8x÷2.8=21÷2.8,
x=7.5.
7
4
7 4 7 7 7 4 4 4 ,
2.8x÷2.8=21÷2.8,
x=7.5.