求未知数 17.5÷0.5x=10 x:3=13:34 ...
求未知数17.5÷0.5x=10x:3=13:348x=5350%x+38x=282.5×4x+36=5614.8-0.1x=7.8....
求未知数 17.5÷0.5x=10 x:3=13:34 8x=53 50%x+38x=28 2.5×4x+36=56 14.8-0.1x=7.8.
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(1)17.5÷0.5x=10
17.5÷0.5x×0.5x=10×0.5x
5x=17.5
5x÷5=17.5÷5
x=3.5;
(2)x:3=
:
x=3×
x=1
x=1
;
(3)
=
5x=3×8
5x=24
x=4.8;
(4)50%x+
x=28
x=28
x÷
=28÷
x=32;
(5)2.5×4x+36=56
10x+36=56
10x+36-36=56-36
10x=20
x=2;
(6)14.8-0.1x=7.8
14.8-0.1x+0.1x=7.8+0.1x
7.8+0.1x=14.8
7.8-7.8+0.1x=14.8-7.8
0.1x=7
x=70.
17.5÷0.5x×0.5x=10×0.5x
5x=17.5
5x÷5=17.5÷5
x=3.5;
(2)x:3=
1 |
3 |
3 |
4 |
3 |
4 |
1 |
3 |
3 |
4 |
x=1
1 |
3 |
(3)
8 |
x |
5 |
3 |
5x=3×8
5x=24
x=4.8;
(4)50%x+
3 |
8 |
7 |
8 |
7 |
8 |
7 |
8 |
7 |
8 |
x=32;
(5)2.5×4x+36=56
10x+36=56
10x+36-36=56-36
10x=20
x=2;
(6)14.8-0.1x=7.8
14.8-0.1x+0.1x=7.8+0.1x
7.8+0.1x=14.8
7.8-7.8+0.1x=14.8-7.8
0.1x=7
x=70.
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