(1)3.5x+x-14=18.4 (2)2.7*2-1.5x=0 (3)13x-6.8x+x=46.8 (4)17.5-0.5x=12.7 (5)5x-1.4x=54解方程,x代表未知数.并写出过程.

(1)3.5x+x-14=18.4 得 4.5x=18.4+14 x = 7.2
(2)2.7*2-1.5x=0 得 1.5x = 5.4 x= 3.6
(3)13x-6.8x+x=46.8 得 7.2x = 46.8 x = 6.5
(4)17.5-0.5x=12.7 得 17.5-12.7=0.5x x = 9.6
(5)5x-1.4x=54 得 3.6x = 54 x = 15

(1)3.5x+x-14=18.4
4.5x=32.4
x=7.2
(2)2.7*2-1.5x=0
1.5x=5.4
x=3.6
(3)13x-6.8x+x=46.8
7.2x=46.8
x=6.5
(4)17.5-0.5x=12.7
0.5x=4.8
x=9.6
(5)5x-1.4x=54
3.6x=54
x=15