解方程:(1)20%x+45%x=1.3 (2) 2x+9分子2*5=2 (3)1.7x-120%x=6.5 (4) x-35%x=39

问题描述:

解方程:(1)20%x+45%x=1.3 (2) 2x+9分子2*5=2 (3)1.7x-120%x=6.5 (4) x-35%x=39

0.2X+.0.45X=1.3 0.6X=1.3 X=13/6

(1)20%x+45%x=1.3
0.2x+0.45x=1.3
0.65x=1.3
x=1.3/0.65
x=2
(2) 2x+9分子2*5=2
2x=2+10/9
2x=28/9
x=28/9*1/2
x=14/9
(3)1.7x-120%x=6.5
1.7x-1.2x=6.5
0.5x=6.5
x=6.5/0.5
x=13
(4) x-35%x=39
0.65x=39
x=39/0.65
x=60 采纳哦

(1)20%x+45%x=1.3
0.2x+0.45x=1.3
0.65x=1.3
x=1.3/0.65
x=2
(2) 2x+9分子2*5=2
2x-9分之10=2
2x=2+10/9
2x=28/9
x=28/9*1/2
x=4/9
(3)1.7x-120%x=6.5
1.7x-1.2x=6.5
0.5x=6.5
x=6.5/0.5
x=13
(4) x-35%x=39
0.65x=39
x=39/0.65
x=60

(1)x=2
(2) x=4/9
(3)x=13
(4)x=60

(1)20%x+45%x=1.3 0.2x+0.45x=1.30.65x=1.3x=1.3/0.65x=2(2) 2x+9分子2*5=2 2x-9分之10=22x=2+10/92x=28/9x=28/9*1/2x=14/9(3)1.7x-120%x=6.51.7x-1.2x=6.50.5x=6.5x=6.5/0.5x=13 (4) x-35%x=390.65x=39x=39/...