c)7x-3x=3,2 d)2$\frac{2}{3}$*x+8$\frac{2}{3}$=3$\frac{1}{3}$
(7-3).x=3,2 8/3*x+26/3=10/3
4.x=3,2 8/3*x=10/3
x=3,2:4 8/3*x=10/3-26/3
x=4/5. 8/3*x=-16/3
x=-16/3:8/3
x=-2.
e)3$\frac{2}{7}$*x-1/8=2$\frac{3}{4}$
23/7*x-1/8=11/4
23/7*x =11/4+1/8
23/7*x =23/8
x =23/8:23/7
x =7/8.
k)(1-3/10-x):(19/10-1-2/5)+4/5=1
(7/10-x):1/2+4/5=1
(7/10-x):1/2=1-4/5
(7/10-x):1/2=1/5
(7/10-x) =1/5*1/2
(7/10-x) =1/10
x =7/10-1/10
x =3/5.
m)(2,8x-32):2/3=-90 n)(4,5-2x)*1$\frac{4}{7}$=11/14
(2,8x-32) =-90*2/3 (4,5-2x)*11/7=11/14
(2,8x-32) =-60 (4,5-2x) =11/14:11/7
2,8x =-60+32 (4,5-2x) =1/2
2,8x =-28 2x =4,5-1/2
x =-28:2,8 2x =4
x =-10. x =4:2
x =2.
Cho mk hay nhất nhé!!!
