(2010•文成县)解方程
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(2010•文成县)解方程
(1)
(1)
2 |
5 |
![(2010•文成县)解方程](/uploads/image/z/19477256-32-6.jpg?t=%EF%BC%882010%E2%80%A2%E6%96%87%E6%88%90%E5%8E%BF%EF%BC%89%E8%A7%A3%E6%96%B9%E7%A8%8B)
(1)
2
5x=6,
2
5x×
5
2=6×
5
2,
x=15;
(2)7.8-3x=0.3,
7.8-3x+3x=0.3+3x,
0.3+3x=7.8,
0.3+3x-0.3=7.8-0.3,
3x=7.5,
3x÷3=7.5÷3,
x=2.5;
(3)2x+40%x=4.8,
(2+40%)x=4.8,
2.4x=4.8,
2.4x÷2.4=4.8÷2.4,
x=2;
(4)
2
5:x=6:
2
5,
6x=
2
5×
2
5,
6x÷6=
4
25÷6,
x=
2
75.
2
5x=6,
2
5x×
5
2=6×
5
2,
x=15;
(2)7.8-3x=0.3,
7.8-3x+3x=0.3+3x,
0.3+3x=7.8,
0.3+3x-0.3=7.8-0.3,
3x=7.5,
3x÷3=7.5÷3,
x=2.5;
(3)2x+40%x=4.8,
(2+40%)x=4.8,
2.4x=4.8,
2.4x÷2.4=4.8÷2.4,
x=2;
(4)
2
5:x=6:
2
5,
6x=
2
5×
2
5,
6x÷6=
4
25÷6,
x=
2
75.