A=\(\dfrac{1313}{2121}\)*\(\dfrac{165165}{143143}\)*\(\dfrac{424242}{151515}\)

A=\(\dfrac{13}{3\cdot7}\)*\(\dfrac{3\cdot5}{13}\)*\(\dfrac{2\cdot7}{5}\)

A=\(\dfrac{13}{21}\)*\(\dfrac{15}{13}\)*\(\dfrac{14}{5}\)

A=\(\dfrac{13\cdot3\cdot5\cdot2\cdot7}{3\cdot7\cdot13\cdot5}\)

A= 2

Trloi chi tiết giúp tớ

=13/21*15/13*14/5

=5/7*14/5

=2

=\(\dfrac{13\cdot101}{21\cdot101}\)*\(\dfrac{165\cdot1001}{143\cdot1001}\)*\(\dfrac{42\cdot10101}{15\cdot10101}\)

=\(\dfrac{13}{21}\)*\(\dfrac{165}{143}\)*\(\dfrac{42}{15}\)

=\(\dfrac{13\cdot15\cdot11\cdot21\cdot2}{21\cdot13\cdot11\cdot15}\)=2

TA CÓ:

a; 1313/2121=13/21    165165/143143=165/143       424242/151515=42/15

=> 13/21 x 165/143 x 42/15=13 x 165 x 42/21 x 143 x 15=22/11=2

b,1995/1995 x 19961996/19931993 x 199319931993/199519951995

=1 x 1996/1993 x 1993/1995

=1 x 1996/1995

=1996/1995

a, 1313/2121 x 165165/143143 x 424242/151515

=13/21 x 165/143 x 13/5

=2

Trl :

bạn kia làm đúng rồi nhé 

    hk tốt nhé bạn @

bằng 2

thank you !

bằng 2 bạn à                                                 ai tích mình sẽ tích lại

1313/2121 x 165165/143143 x 424242/151515

= 13/21 x 15/13 x 14/5

= 2

Hok tốt nha !~

1313/2121x165165/143143x424424/151515

=13/21x15/13x14/5

=2

b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12=37/15

\(\frac{1313}{2121}\)x\(\frac{165165}{143143}\)x\(\frac{424242}{151515}\)

=\(\frac{13x101}{21x101}\)X\(\frac{165x1001}{143x1001}\)X\(\frac{42x10101}{15x10101}\)

=\(\frac{13}{21}\)x\(\frac{165}{143}\)x\(\frac{42}{15}\)

=\(\frac{13}{21}\)x\(\frac{15}{13}\)x\(\frac{14}{5}\)

=\(\frac{13x15x14}{21x13x5}\)

=2