1、解方程。

2x-16=5.6

2x-16+16=5.6 +16

2x=21.6

X=10.8

3.2x+1.5×2=12.6

3.2x+3=12.6

3.2x+3-3=12.6-3

3.2x=9.6

3.2x÷3.2=9.6÷3.2

x=3

5（x-2.5） =5.5

5（x-2.5）÷5 =5.5÷5

x-2.5=1.1

x-2.5+2.5=1.1+2.5

X=3.6

3.6（5-x）=7.2

3.6（5-x）÷3.6 =7.2 ÷3.6

5-x =2

5-x+x =2+x

5=2+x

5-2=2+x-2

X=3

（x+6.9）÷4=2.5

（x+6.9）÷4×4=2.5×4

x+6.9=10

x+6.9-6.9=10-6.9

x=3.1

（2x-4.6）÷6=1.8

（2x-4.6）÷6×6=1.8×6

2x-4.6 =10.8

2x-4.6+4.6 =10.8+4.6

2x =10.8+4.6

2x=15.4

2x÷2=15.4÷2

x=7.7

(1)2x+8=16，x=4 (2)x/5=10,x=500 (3)x+7x=8,x=1 (4)9x-3x=6,x=1 (5)6x-8=4,x=2 (6)5x+x=9,x=3/2 (7)x+8=6x,x=8/5 (8)4/5x=20,x=25 (9)2x-6=12,x=9 (10)7x+7=14,x=1 (11)6x-6=0,x=1 (12)5x+6=11,x=1 (13)2x-8=10,x=9 (14)1/2x-8=4,x=24 (15)x-5/6x=7,x=42 (16)3x+7=28,x=7 (17)3x-7=26,x=11 (18)9x-x=16,x=2 (19)24x+x=50,x=2 (20)6/7x-8=4,x=14 (30)3x-9=30,x=13