解方程.75%x-1=14 15x?18=14 25+15x=1 x?13x=2.6 15%x-8=7 13x
解方程.75%x-1=1415x?18=1425+15x=1x?13x=2.615%x-8=713x+15=1....
解方程.75%x-1=14 15x?18=14 25+15x=1 x?13x=2.6 15%x-8=7 13x+15=1.
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(1)75%x-1=14
75%x-1+1=14+1
75%x=15
75%x÷75%=15÷75%
x=20;
(2)
x-
=
x-
+
=
+
x=
x÷
=
÷
x=
;
(3)
+
x=1
+
x-
=1-
x=
x÷
=
÷
x=3;
(4)x-
x=2.6
75%x-1+1=14+1
75%x=15
75%x÷75%=15÷75%
x=20;
(2)
1 |
5 |
1 |
8 |
1 |
4 |
1 |
5 |
1 |
8 |
1 |
8 |
1 |
4 |
1 |
8 |
1 |
5 |
3 |
8 |
1 |
5 |
1 |
5 |
3 |
8 |
1 |
5 |
x=
15 |
8 |
(3)
2 |
5 |
1 |
5 |
2 |
5 |
1 |
5 |
2 |
5 |
2 |
5 |
1 |
5 |
3 |
5 |
1 |
5 |
1 |
5 |
3 |
5 |
1 |
5 |
x=3;
(4)x-
1 |
3 |