1/4x + 1/8(120-x) =20

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/24 00:52:36
1/4x+1/8(120-x)=201/4x+1/8(120-x)=201/4x+1/8(120-x)=201/4x+1/8(120-x)=20两边同乘以8得2x+120-x=160x=401/4x+

1/4x + 1/8(120-x) =20
1/4x + 1/8(120-x) =20

1/4x + 1/8(120-x) =20
1/4x + 1/8(120-x) = 20
两边同乘以 8 得
2x + 120 - x = 160
x = 40


1/4x+15-1/8x=20
1/8x=5
x=40