1.

\(\frac{1}{2}\)+\(\frac{2}{3}\)+\(\frac{3}{4}\)

\(\frac{4}{5}\)+\(\frac{4}{3}\)+\(\frac{6}{7}\)

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

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

\(\frac{8}{9}\)-\(\frac{5}{6}\)

\(\frac{99}{108}\)-\(\frac{40}{72}\)

\(\frac{16}{17}\)-\(\frac{12}{13}\)

\(\frac{99}{153}\)-\(\frac{75}{125}\)

\(8\frac{7}{10}\)+\(2\frac{3}{4}\)=

\(2\frac{7}{8}\)-\(1\frac{3}{8}\)=

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

\(4\frac{1}{2}\):\(2\frac{1}{7}\)=

\(2\frac{1}{5}\)+\(1\frac{7}{10}\)=

\(8\frac{1}{4}\)-\(5\frac{1}{2}\)=

\(3\frac{4}{5}\)x\(\frac{10}{21}\)=

\(1\frac{4}{7}\):\(2\frac{3}{8}\)

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

Đề test thành viên : Team Math is easy 

Bài 1: Tính nhanh:

A. \(\frac{1}{1\times2}\)\(+\frac{1}{2\times3}\)\(+\frac{1}{3\times4}\)\(+............+\frac{1}{1999\times2000}\)

B. \(\frac{1}{2}\)\(+\frac{1}{6}\)\(+\frac{1}{12}\)\(+\frac{1}{20}\)\(+...........+\frac{1}{39800}\)

C. \(\frac{1}{2}\)\(+\frac{1}{4}\)\(+\frac{1}{8}\)\(+\frac{1}{16}\)\(+\frac{1}{32}\)\(+\frac{1}{64}+\frac{1}{128}\)\(+\frac{1}{256}\)\(+\frac{1}{512}\)

# Phó team

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

Đúng ghi Đ, sai khi S:

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

b,\(6\frac{3}{4}\)-\(1\frac{1}{4}\)=\(5\frac{2}{4}\)

c,\(3\frac{1}{2}\)x\(2\frac{2}{3}\)=\(9\frac{1}{3}\)

d,\(4\frac{1}{6}\):\(2\frac{1}{5}\)=\(2\frac{5}{6}\)