Bài 1 :
a) $\frac{5}{3}$ - $\frac{7}{24}$
=$\frac{40}{24}$ - $\frac{7}{24}$
= $\frac{33}{24}$
= $\frac{11}{8}$
b) $\frac{3}{4}$ : $\frac{6}{5}$ - $\frac{1}{8}$
=$\frac{3}{4}$ . $\frac{5}{6}$ - $\frac{1}{8}$
=$\frac{5}{8}$ - $\frac{1}{8}$
= $\frac{4}{8}$
= $\frac{1}{2}$
c) $\frac{7}{3}$ - $\frac{4}{3}$ . $\frac{-2}{5}$
=$\frac{7}{3}$ - $\frac{-8}{15}$
=$\frac{35}{15}$ - $\frac{-8}{15}$
= $\frac{35}{15}$ + $\frac{8}{15}$
= $\frac{43}{15}$
Bài 2 :
a) x - $\frac{3}{4}$ = (-5)
x = $\frac{-5}{1}$ + $\frac{3}{4}$
x = $\frac{-20}{4}$ + $\frac{3}{4}$
x = $\frac{-17}{4}$
Vậy x = $\frac{-17}{4}$
b) 4/2 - x = 5/7 : 10/21
4/2 - x = 5/7 . 21/10
4/2 - x = 3/2
x = 4/2 - 3/2
x = 1/2
Vậy x = 1/2
c) 2/3 . x + 1/2 = -5/6
2/3 . x = -5/6 - 1/2
2/3 . x = -5/6 + -1/2
2/3 . x = -5/6 + -3/6
2/3 . x = -4/3
x = -4/3 : 2/3
x = -4/3 . -3/2
x = -2
Vậy x = -2
Cho mik 5 sao và câu trả lời hay nhất nha bạn