1. Tìm x bt:
a) x-43=(57-x)-50
b) $\frac{x+2}{6}$=$\frac{-15}{6}$
2. Tìm x ∈ Z bt:
a) $\frac{1}{3}$+$\frac{3}{35}$<$\frac{x}{210}$<$\frac{4}{7}$+$\frac{3}{5}$+$\frac{1}{3}$
b) $\frac{3}{5}$+$\frac{-14}{3}$<x<$\frac{8}{5}$+$\frac{8}{10}$
c) $\frac{5}{21}$+$\frac{-3}{7}$<$\frac{x}{21}$<$\frac{-2}{7}$+$\frac{8}{21}$
Loga
Sinh Học lớp 12
