Question

Tính nhanh :

3 /5 * 7 /9 - 3 /5 *2 / 9

2006 /2005 * 3 /4 -  3 /4 * 1 / 2005

Ai nhanh mình tick cho

Answer 1

a)\(\frac{3}{5}.\frac{7}{9}-\frac{3}{5}.\frac{2}{9}=\frac{3}{5}\left(\frac{7}{9}-\frac{2}{9}\right)=\frac{3}{5}.\frac{5}{9}=\frac{1}{3}\)

b)\(\frac{2006}{2005}.\frac{3}{4}-\frac{3}{4}.\frac{1}{2005}=\frac{3}{4}\left(\frac{2006}{2005}-\frac{1}{2005}\right)=\frac{3}{4}.1=\frac{3}{4}\)

k nhé Cô nàng đáng yêu!

Answer 2

3 / 5 * 7 / 9 - 3 / 5 * 2 / 9 = 15 / 45 

2006 / 2005 * 3 / 4 - 3/4 * 1/ 2005 = 1203 / 1604

Answer 3

=\(\frac{3}{5}\)x [\(\frac{7}{9}\)-\(\frac{2}{9}\)]=\(\frac{3}{5}\)x \(\frac{5}{9}\)

                                 =\(\frac{3}{9}\)=\(\frac{1}{3}\)

=\(\frac{3}{4}\)-[\(\frac{2006}{2005}\)-\(\frac{1}{2005}\)]=\(\frac{3}{4}\)x 1=\(\frac{3}{4}\)

Answer 4

\(=\frac{3}{5}\cdot\left(\frac{7}{9}-\frac{2}{9}\right)=\frac{3}{5}\cdot\frac{5}{9}=\frac{1}{3}\)

\(\frac{3}{4}\cdot\left(\frac{2006}{2005}-\frac{1}{2005}\right)=\frac{3}{4}\cdot1=\frac{3}{4}\)

Answer 5

a) 1/3 

b) 3/4 

nha

Answer 6

3/4 nha bạn

Answer 7

2006/2005× 3/4- 3/4× 1/2005