Bài 1:Tính hợp lý
a) A= $\frac {-5}{11}$ + 75% -1$\frac{1}{2}$ -$\frac{1}{4}$ +$\frac{6}{-11}$
b)B= $\frac{19-19.5}{19.2-76}$
c)C= $\frac{-7}{11}$. $\frac{4}{13}$+ $\frac{7}{11}$. $\frac{-9}{13}$+ $\frac{6}{11}$
d) D= 7 $\frac{5}{11}$ - (5$\frac{5}{8}$-4 $\frac{6}{11}$ )
Bài 2 Tìm x , biết
a) $\frac{3}{7}$ x - $\frac{3}{4}$= $\frac{1}{2}$
b) $\frac{7}{12}$- 2$\frac{1}{2}$ : x =$\frac{-5}{12}$
c) x : ($\frac{3}{8}$ - $\frac{3}{4}$ )= -3$\frac{1}{2}$
d) (2x+ $\frac{3}{4}$ ) ( $\frac{5}{7}$ - 3x)= 0
Loga
Sinh Học lớp 12
