Question

解方程 （写出过程!!!!!!!!!!!!!!!!!!!!）

8.5x+2.2x=117.7 0.4(x-1.5)=1.6 8x-34.34\1.7=18

2.1*3+3.5x=7 8x-3x+2.5*3=15 20+4x=6x-24

5(x-1)=x+1 3(3x-2)=10-0.5(x+3.5)

Answer 1

8.5x+2.2x=117.7
10.7x=117.7
107x=1177
x=11

0.4(x-1.5)=1.6
0.4x-6=1.6
4x-60=16
4x=76
x=19

8x-34.34\1.7=18
8x-20.2=18
8x=38.2
x=4.775

2.1*3+3.5x=7
3.5x=7-6.3
35x=70
x=2

8x-3x+2.5*3=15
5x+7.5=15
5x=7.5
x=1.5

20+4x=6x-24
20+24=6x-4x
44=2x
x=22

5(x-1)=x+1
5x-5=x+1
5x-x=1+5
4x=6
x=1.5

3(3x-2)=10-0.5(x+3.5)
9x-6=10-0.5x-1.75
9x+0.5x=8.25+6
9.5x=14.25
x=1.5

Answer 2

8.5x+2.2x=117.7
解：10.7x=117.7
x=117.7/10.7
x= 11