解方程: 4-23x=25 x:34=13 2x+0.7=7.7 x-2
展开全部
(1)4-
x=
,
4-
x+
x-
=
+
x-
,
=
x,
x=
,
x×
=
×
,
x=
,
(2)x:
=
,
x:
=1:3,
3x=1×
,
3x÷3=
÷3,
x=
,
(3)2x+0.7=7.7,
2x+0.7-0.7=7.7-0.7,
2x=7,
2x÷2=7÷2,
x=3.5,
(4)x-25%x=0.5.
0.75x=0.5,
0.75x÷0.75=0.5÷0.75,
x=
.
2 |
3 |
2 |
5 |
4-
2 |
3 |
2 |
3 |
2 |
5 |
2 |
5 |
2 |
3 |
2 |
5 |
18 |
5 |
2 |
3 |
2 |
3 |
18 |
5 |
2 |
3 |
3 |
2 |
18 |
5 |
3 |
2 |
x=
27 |
5 |
(2)x:
3 |
4 |
1 |
3 |
x:
3 |
4 |
3x=1×
3 |
4 |
3x÷3=
3 |
4 |
x=
1 |
4 |
(3)2x+0.7=7.7,
2x+0.7-0.7=7.7-0.7,
2x=7,
2x÷2=7÷2,
x=3.5,
(4)x-25%x=0.5.
0.75x=0.5,
0.75x÷0.75=0.5÷0.75,
x=
2 |
3 |
展开全部
解:(1)4-23x=25,
4-23x+23x-25=25+23x-25,
185=23x,
23x=185,
23x×32=185×32,
x=275,
(2)x:34=13,
x:34=1:3,
3x=1×34,
3x÷3=34÷3,
x=14,
(3)2x+0.7=7.7,
2x+0.7-0.7=7.7-0.7,
2x=7,
2x÷2=7÷2,
x=3.5,
(4)x-25%x=0.5.
0.75x=0.5,
0.75x÷0.75=0.5÷0.75,
x=23.
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