Question

解下列方程(过程写清楚)1." 0.1x+1=0.2 " 2." 0.16(x+5)=1-0.2" 3." 0.625=

Answer 1

1.0.1x+1=0.2

x=(0.2-1)/0.1

x=-8

2 0.16(x+5)=1-0.2

0.16(x+5)=0.8

x+5=5

x=0

3.0.625=0.5(y-2)

1.25=y-2

y=3.25

4.-0.1(x-10)=9-0.2(1-x)

-0.1x+1=9-0.2+0.2x

0.3x=1-9+0.2

0.3x=-7.8

x=-26