a)17/6-(x-7/6)=7/4 b)4/3+(1,25-x)=2,25 c)2x-3=x+1/2
(x-7/6)=17/6-7/4 4/3+(5/4-x)=9/4 2x+x=-3+1/2
x-7/6=13/12 5/4-x=9/4-4/3 3x=-5/2
x=13/12+7/6 5/4-x=11/12 x=-5/2÷3
x=9/4 x=5/4-11/12 x=-5/6
vậy x=9/4 x=1/3 vậy x=-5/6
vậy x=1/3
d)4x-(2x+1)=3-1/3+x e)2x - 1/2 - 1/6 - 1/12 - ... -1/49.50=7 - 1/50 + x
4x-2x+1=8/3+x 2x - (1/2 - 1/6 - 1/12 - ... -1/49.50)=7 - 1/50 + x
2x+1=8/3+x 2x - (1/1.2 - 1/2.3 - 1/3.4 - ... -1/49.50)=7 - 1/50 + x
2x+x=8/3+1 2x - (1/1.2 - 1/2.3 - 1/3.4 - ... -1/49.50)=7 - 1/50 + x
3x=11/3 2x - (1-1.2 - 1/2-1/3 - 1/3-1/4 - ... -1/49-1/50)=7 - 1/50 + x
x=11/9 2x-[1-(1/2- 1/2)-(1/3- 1/3)-(1/4 -1/4)- ...- (1/49-1/49)-1/50Ư=7 - 1/50 + x
vậy x=11/9 2x-[1+0+0+0+ ...+0+1/50]=7 - 1/50 + x
2x-[1+1/50]=7 - 1/50 + x
2x+x=7 - 1/50-[1-1/50]
2x+x=7 - 1/50-1+1/50
3x=6
x=2
vậy x=2
