Question

[Hoàng Thị Trâm]

Bài 1.

\(\frac{75}{100}\)+\(\frac{18}{21}\)+\(\frac{19}{32}\)+\(\frac{1}{4}\)+\(\frac{3}{21}\)+\(\frac{3}{32}\)

Bài 2.

\(\frac{7}{13}\)x\(\frac{5}{6}\)x\(\frac{5}{13}\)

Bài 3.Tính giá trị biểu thức sau.

a.0,1 + 0,2 + 0,3 + ... + 0,9 + 0,10 +0,11 + ... + 0,19.

b.( 1999 x 1998 +1998 x 1997 ) x (1 + \(\frac{1}{2}\): 1 \(\frac{1}{2}\) - 1 \(\frac{1}{3}\) )

Answer 1

[Huỳnh Đan]

Bài 1.

\(\frac{75}{100}+\frac{18}{21}+\frac{19}{32}+\frac{1}{4}+\frac{3}{21}+\frac{3}{32}\)

\(=\left(\frac{75}{100}+\frac{1}{4}\right)+\left(\frac{18}{21}+\frac{3}{21}\right)+\left(\frac{19}{32}+\frac{3}{32}\right)\)

\(=1+1+\frac{11}{16}\)

\(=2+\frac{11}{16}\) \(=\frac{43}{16}\)