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求未知数x160×25%-1.3x=17.9x5-x6=0.40.30.5=x+12x−1.
题目详情
求未知数x
160×25%-1.3x=17.9
-
=0.4
=
.
160×25%-1.3x=17.9
x |
5 |
x |
6 |
0.3 |
0.5 |
x+1 |
2x−1 |
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答案和解析
(1)160×25%-1.3x=17.9
40-1.3x=17.9
40-1.3x+1.3x=17.9+1.3x
17.9+1.3x=40
17.9+1.3x-17.9=40-17.9
1.3x=22.1
1.3x÷1.3=22.1÷1.3
x=17
(2)
-
=0.4
(
-
)×30=0.4×30
6x-5x=12
x=12
(3)
=
0.3×(2x-1)=0.5×(x+1)
0.6x-0.3=0.5x+0.5
0.6x-0.3+0.3=0.5x+0.5+0.3
0.1x=0.8
0.1x÷0.1=0.8÷0.1
x=8
40-1.3x=17.9
40-1.3x+1.3x=17.9+1.3x
17.9+1.3x=40
17.9+1.3x-17.9=40-17.9
1.3x=22.1
1.3x÷1.3=22.1÷1.3
x=17
(2)
x |
5 |
x |
6 |
(
x |
5 |
x |
6 |
6x-5x=12
x=12
(3)
0.3 |
0.5 |
x+1 |
2x−1 |
0.3×(2x-1)=0.5×(x+1)
0.6x-0.3=0.5x+0.5
0.6x-0.3+0.3=0.5x+0.5+0.3
0.1x=0.8
0.1x÷0.1=0.8÷0.1
x=8
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