解6道方程

(1)3.2x-0.8*6.5=9.2
(2)20(x+2.5)=210
(3)6.5(x-4.7)=33.8
(4)5.8*2.4+0.5x=14
(5)7.2(3.6+x)=57.6
(6)1.2x-3.5/0.01=250

(1)3.2x-0.8*6.5=9.2
解:3.2X-5.2=9.2
3.2X=9.2-5.2
3.2X=4
X=4/3.2
X=1.25

(2)20(x+2.5)=210
解:20X+20*2.5=210
20X+50=210
20X=210-50
20X=160
X=160/20
X=8

(3)6.5x-30.55=33.8
6.5x=33.8+30.55
x=9.9

(4)5.8*2.4+0.5x=14
0.5x=0.08
x=0.16

(5)7.2*(3.6+x)=57.6
3.6+x=8
x=4.4

(6)1.2x-3.5/0.01=250
1.2x=600
x=500

相信我,没错的……

1.3.2x=9.2++5.2=14.4
x=4.5
2.x+2.5=10.5
x=8
3.x-4.7=5.2
x=9.9
4.0.5x=14-13.92
0.5x=0.08
x=0.16
5.3.6+x=8
x=4.4
6.1.2x-350=250
1.2x=600
x=500

(1)x=4.5
(2)x=8
(3)x=9.9
(4)x=4.8
(5)x=25.2
(6)x=500

(2)20x+50=210