Hai bài ae giúp mình nha
Bai 1Tinh nhanh
a. $\frac{1}{15}$ .$\frac{7}{15}$+ $\frac{8}{15}$ .$\frac{1}{15}$- $\frac{16}{15}$
b) $\frac{-5}{11}$+ ($\frac{-6}{11}$ +1)
c. 6$\frac{4}{5}$ -(1$\frac{2}{3}$ +3$\frac{4}{5}$)
d. $\frac{5}{12}$ -$\frac{-7}{6}$
Baif 2
Tim x biet
a) $\frac{x}{12}$= $\frac{-1}{24}$- $\frac{1}{8}$
b) x + 25% x= -1,25
c) $\frac{2}{3}$+ $\frac{3}{4}$ :x=$\frac{-1}{6}$
d) $\frac{4}{7}$.x- $\frac{1}{2}=$ $\frac{1}{5}$
Loga
Sinh Học lớp 12
