5x5x5x5=625

5+5+5+5=20

9x9x9x9=6561

9+9+9+9=36

5x5x5x5=5⁴

5+5+5+5=5x4

9x9x9x9=9⁴

9+9+9+9=9x4

Bài 1:1×2×3×4×5×6×7×8×9×10 bằng mấy? Bài 2:5×5×5×5×5×5×5×5×5×5=3628800

 Bài 2:9×9×9×9×9×9×9×9×9×9 = 3486784401 (bạn k cho mình nha)

bài 1; = 3628800

bài 2; = 9765625

bài 3; =3486784401

\(\frac{9}{10}+\frac{7}{9}+\frac{5}{8}+\frac{3}{7}+\frac{3}{5}+\frac{2}{5}+\frac{4}{7}+\frac{3}{8}+\frac{2}{9}+\frac{1}{10}\)\(\frac{1}{10}\)

= ( 9/10 + 1/10 ) + ( 7/9 + 2/9 ) + ( 5/8 + 3/8 ) + ( 3/7 + 4/7 ) + ( 3/5 + 2/5 )

= 1 + 1 + 1 + 1 + 1

=   1 x 5

=     5

\(\left(\frac{9}{10}+\frac{1}{10}\right)+\left(\frac{7}{9}+\frac{2}{9}\right)+\left(\frac{5}{8}+\frac{3}{8}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)2/5)

=1+1+1+1+1=5

.

( 9/ 10 + 1/10 ) + ( 7/9 + 2/9) + ( 5/8 + 3/8 ) + ( 3/7 + 4/ 7) + ( 2/5 + 3/5 ) = 1 + 1+ 1+1 + 1 = 5 

a) Đáp án C.

b) Đáp án D.

5/4 , 4/4 , 8/9 , 5/9

5/4; 4/4; 8/9; 5/9 nha

5/9 ; 8/9 ; 4/4 ;5/4

= 1192 nhé

 hok tốt

:D

9.2=18

9.3=27

9.4=36

9.5=45

9.6=54

9.7=63

9.8=72

9.9=81

9.10=90

T mik nhé

9 x 2 = 18

9 x 3 = 27 

9 x 4 = 36

9 x 5 = 45

9 x 6 = 54

9 x 7 = 63

9 x 8 = 72

9 x 9 = 81

k minh di nhe ban 

9 x 2 = 18 

 9 x 3 =27 

9 x 4 = 36

9 x 5 = 45

9 x 6 = 54 

9 x 7 = 63 

9 x 8 = 72

9 x 9 = 81

9 x 10 = 90

Mik trả lời được hết rồi kết bn nha

9:9=1

9:9=1

9:9 = 1 nha

\(\dfrac{5}{11}+\dfrac{4}{11}=\dfrac{9}{11}\\ \dfrac{11}{10}+\dfrac{9}{10}=\dfrac{20}{10}=2\\ \dfrac{11}{12}+\dfrac{5}{12}=\dfrac{16}{12}=\dfrac{4}{3}\\ \dfrac{7}{9}+\dfrac{5}{9}=\dfrac{12}{9}=\dfrac{4}{3}\)

\(\dfrac{5}{11}+\dfrac{4}{11}=1\)

\(\dfrac{11}{10}+\dfrac{9}{10}=\dfrac{20}{10}=2\)

\(\dfrac{11}{12}+\dfrac{5}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)

\(\dfrac{7}{9}+\dfrac{5}{9}=\dfrac{12}{9}=\dfrac{4}{3}\)

5/11+4/11=9/11

11/10+9/10=20/10=2

11/12+5/12=16/12=4/3

7/9+5/9=12/9=4/3 nhé =)