\(\frac{21}{11}\times\frac{22}{17}:\frac{42}{34}\)

\(=\frac{44}{17}:\frac{42}{34}\)

\(=\frac{44}{21}\)

Hok tốt

\(\frac{21}{11}.\frac{22}{17}\div\frac{42}{34}\)

\(=\frac{21}{11}.\frac{22}{17}.\frac{34}{42}\)

\(=\frac{21.22.34}{11.17.42}\)

\(=\frac{21.11.2.17.2}{11.17.2.21}\)

\(=2\)

#)Giải :

\(\frac{21}{11}x\frac{22}{17}:\frac{42}{34}=\frac{42}{17}:\frac{42}{34}=\frac{42}{17}x\frac{34}{42}=\frac{34}{17}=2\)

#)Chúc bn học tốt :D

21/11x22/17;42/34

=42/17:42/34

=2

=2 nha bạn

nhớ k mình nha

bạn nào 10 sp hoặc trên 10 sp k đúng giúp mình đi ạ

cám ơn

\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)

\(=\frac{42}{17}.\frac{68}{63}\)

\(=\frac{8}{3}\)

21/11*22/17*68/63=42/17*68/63=8/3

\(\frac{22}{17}.\frac{34}{63}.\frac{21}{11}=\frac{11.2.17.2.21}{17.21.3.11}=\frac{2.2}{3}=\frac{4}{3}\)

\(\frac{22}{17}.\frac{34}{63}.\frac{21}{11}=\frac{11.2.17.2.21}{17.21.3.11}=\frac{2.2}{3}=\frac{4}{3}\)

\(\frac{22}{17}\cdot\frac{34}{63}\cdot\frac{21}{11}=\frac{22\cdot34\cdot21}{17\cdot63\cdot11}=\frac{2\cdot2\cdot1}{1\cdot3\cdot1}=\frac{4}{3}\)

\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\) = \(\dfrac{42}{17}\times\dfrac{68}{63}\) = \(\dfrac{8}{3}\)

 Vì \(\dfrac{21}{11}\times\dfrac{22}{17}=\dfrac{21\times22}{11\times17}=\dfrac{42}{17}\)

 Vậy:

 \(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) = 

=-3720

đồ bấm máy tính ko chấp

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31

+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+4

7+48+49+50-999-888-777-666-555-444-333-222-111= -3720

a,8/3

b,1/5

c,17/135

d,2/3

e,5/2

a)\(\frac{8}{3}\)

b)\(\frac{1}{5}=0,2\)

c)\(\frac{17}{135}\)

d)\(\frac{2}{3}\)

e)\(\frac{5}{2}=2,5\)

a) 21/11 x 22/17 x 68/63

= (21 x 22 x 68)/ (11 x 17 x 63)

= 8/3

b) 5/14 x 7/13 x 26/25

= (5 x 7 x 26)/(14 x 13 x 25)

= (5 x 7 x 13 x 2) / ( 7 x 2 x 13 x 5 x 5)

= 1/5

c) 7/9 x 3/35 x 17/9

= (7 x 3 x 17)/ (9 x 35 x 9 )

= 17/135

d) 11/17 : 33/34

= 11/17 x 34/33

= (11 x 34)/(17 x 33)

= (11 x 17 x 2) / ( 17 x 33 x 11)

=2/33

e) 15,7 : 6,28

= 157/10 : 157/ 25

= 157/10 x 25/157

= (157 x 25) / ( 10 x 157)

= 25/10 = 5/2

k nha