Question

             

1. Tính bằng cách thuận tiện

a ,15/3 x 7/5 +7/5 x10/3 + 7/5                            b .1212/1717 x 165165/132132  x 515151/151515 

                                       c. 2009 + 3567 + 6433 - 1009

 

Answer 1

a) 15/3 x 7/5 + 7/5 x 10/3 + 7/5

= (15/3 + 10/3  + 1) x 7/5

= 28/3 x 7/5

= 196/15

c) 2009 + 3567 + 6433 - 1009

= (2009 - 1009 ) + (3567 + 6433)

= 1000 + 10000

= 11000

Answer 2

\(\frac{15}{3}\)x\(\frac{7}{5}+\frac{7}{5}\)x\(\frac{10}{3}+\frac{7}{5}\)

= \(\frac{15}{3}\)x \(\frac{7}{5}+\frac{7}{5}\)x \(\frac{10}{3}+\frac{7}{5}x1\)

=\(\left(\frac{15}{3}+\frac{10}{3}+1\right)\)x \(\frac{7}{5}\)

= \(\frac{100}{3}\)x \(\frac{7}{5}\)

=\(\frac{140}{3}\)

\(\frac{1212}{1717}\)x \(\frac{165165}{132132}\)x\(\frac{515151}{515151}\)

= \(\frac{12}{17}\)x \(\frac{165}{132}\)x \(\frac{51}{51}\)

= \(\frac{12}{17}\)x\(\frac{165}{132}\)x 1

= \(\frac{165}{187}\)

2009 + 3567 + 6433 - 1009

= ( 2009 - 1009 ) + (3567 +6433 )

=1000 + 10000

= 11000

Answer 3

phần b mk ko chắc lắm đâu

Answer 4

Nhưng mk viêt rất mỏi tay nên 

Hãy ủng hộ mk !!!!!!!!!!!