Question

[Pham Trong Bach]

Giải các phương trình sau:

a) $\frac{\mathrm{x}+81}{19}+\frac{\mathrm{x}+82}{18}=\frac{\mathrm{x}+84}{16}+\frac{\mathrm{x}+85}{15};$ 

b) $\frac{\mathrm{x}-22}{8}+\frac{\mathrm{x}-21}{9}+\frac{\mathrm{x}-20}{10}+\frac{\mathrm{x}-19}{11}=4$;

c) $\frac{-\mathrm{x}+12}{7}+\frac{-\mathrm{x}+13}{6}=\frac{-\mathrm{x}+15}{4}+\frac{-\mathrm{x}+16}{3};$ 

d) $\frac{\mathrm{x}+19}{3}+\frac{\mathrm{x}+13}{5}=\frac{\mathrm{x}+7}{7}+\frac{\mathrm{x}+1}{9}.$ Gợi ý: Cộng thêm 3.

Answer 1

[Cao Minh Tâm]