1.1/6(20x+50)+2/3(5+2x)=0 2.1/2{1/2【1/2(1/2x-3)-3】-3}-3=0

问题描述:

1.1/6(20x+50)+2/3(5+2x)=0 2.1/2{1/2【1/2(1/2x-3)-3】-3}-3=0

1/6(20x+50)+2/3(5+2x)=0 两边乘6
20x+50+4(5+2x)=0
20x+50+20+8x=0
28x=-70
x=-70/28
x=-5/2


1/2{1/2【1/2(1/2x-3)-3】-3}-3=0
1/2{1/2【1/2(1/2x-3)-3】-3}=3
1/2【1/2(1/2x-3)-3】-3=6
1/2【1/2(1/2x-3)-3】=9
1/2(1/2x-3)-3=18
1/2(1/2x-3)=21
1/2x-3=42
1/2x=45
x=90