bài 1
a)x-1/15=1/10 b)-2/15-x=8/10 c)x+1/8=2/5-(-1/3)
x=1/10+1/15 x=(-2/15)-8/10 x+1/8=2/5+1/3
x=3/30+2/30 x=(-6/30)-24/30 x+1/8=11/15
x=5/30 x=-30/30 x=11/15-1/8
x=1/6 x=-1 x=73/120
vậy x=1/6 vậy x=-1 vậy x=73/120
d)3/7-x=1/4-3/5 e)|x+4/15|-|-3,75|=-|-2,15| f) x-3/4<2/3(x∈Z)
3/7-x=-7/20 |x+4/15|-3,75=-2,15 x<2/3+3/4
x=3/7-(-7/20) |x+4/15|=-2,15+3,75 x<17/12
x=109/140 |x+4/15|=1,6 ⇒x là những số nguyên hơn 17/12
vậy x=109/140 ⇒x+4/15=-1,6 hoặc x+4/15=1,6 vậy x∈ Z (<17/12)
x=-28/15 x=4/3
vậy x∈{-28/15;4/3}
