1.Tìm x, biết:

a.\(\frac{1}{2}\)x\(x\)+\(\frac{2}{3}\)=\(\frac{5}{2}\)

b.\(\frac{x}{12}\)+\(\frac{5}{24}\)=\(\frac{5}{6}\)

c.(1234+\(x\)+766)x0,25=6,2:0,01

2.Tính bằng cách hợp lý.

A=\(\frac{1}{2}\)x\(\frac{5}{7}\)+\(\frac{9}{7}\)x0,3+\(\frac{1}{2}\)x\(\frac{4}{7}\)+\(\frac{9}{4}\)+\(\frac{9}{7}\)x0.2

B=\(\frac{2002\cdot15-1}{2001+2002\cdot14}\)

1.Tìm x, biết:

a.\(\frac{1}{2}\)x\(x\)+\(\frac{2}{3}\)=\(\frac{5}{2}\)

b.\(\frac{x}{12}\)+\(\frac{5}{24}\)=\(\frac{5}{6}\)

c.(1234+\(x\)+766)x0,25=6,2:0,01

2.Tính bằng cách hợp lý.

A=\(\frac{1}{2}\)x\(\frac{5}{7}\)+\(\frac{9}{7}\)x0,3+\(\frac{1}{2}\)x\(\frac{4}{7}\)+\(\frac{9}{4}\)+\(\frac{9}{7}\)x0.2

B=\(\frac{2002\cdot15-1}{2001+2002\cdot14}\)

Tính nhanh 

a, \(\frac{6}{9}\)+\(\frac{5}{7}\)+\(\frac{1}{3}\)

b, \(\frac{17}{7}\)+\(\frac{6}{5}\)- \(\frac{20}{14}\)

c , \(\frac{2}{5}\)x\(\frac{1}{4}\)+ \(\frac{3}{4}\)x\(\frac{2}{5}\)

d, \(\frac{6}{11}\):\(\frac{4}{6}\)+\(\frac{5}{11}\): \(\frac{2}{3}\)

Tính nhanh 

a, \(\frac{6}{9}\)+\(\frac{5}{7}\)+\(\frac{1}{3}\)

b, \(\frac{17}{7}\)+\(\frac{6}{5}\)- \(\frac{20}{14}\)

c , \(\frac{2}{5}\)x\(\frac{1}{4}\)+ \(\frac{3}{4}\)x\(\frac{2}{5}\)

d, \(\frac{6}{11}\):\(\frac{4}{6}\)+\(\frac{5}{11}\): \(\frac{2}{3}\)

tính

a, 2\(\frac{3}{5}\) x 1\(\frac{1}{4}\) + \(\frac{5}{2}\) =

b, 1\(\frac{3}{5}\) : \(\frac{8}{27}\) x    \(\frac{5}{3}\) =

c, \(\frac{16}{6}\) : 2\(\frac{1}{6}\) : 1\(\frac{1}{7}\) =

d, 2\(\frac{1}{3}\) + 1\(\frac{3}{5}\) x    \(\frac{5}{9}\) =

giúp mình nha!