63.66+63.54+120.37=63.(66+54)+120.37=63.120+120.37=120.(63.37)=120.100=12000

=12000 bn nhe !

CHÚC BN HỌC TỐT!!!!

 63 x 66+63x54+120x37

=63 x (66+54)+120 x 37

=63 x 120+120x37

=120x (63+37)

=120 x 100

=12000

9 x 6 = 54        9 x 7 = 63        9 x 5 = 45        9 x 8 = 72

54 : 9 = 6        63 : 9 = 7        45 : 9 = 5        72 : 9 = 8

54 : 6 = 9        63 : 7 = 9        45 : 5 = 9        72 : 8 = 9

9 x 6 = 54          9 x 7 = 63          9 x 5 = 45          9 x 8 = 72

54 : 9 = 6           63 : 9 = 7           45 : 9 = 5          72 : 9 = 8

54 : 6 = 9           63 : 7 = 9           45 : 5 =9           72 : 8 =9

9 x 5 = 45

9 x 6 = 54

9 x 7 = 63

9 x 8 = 72

45 : 9 = 5

54 : 9 = 6

63 : 9 = 7

72 : 9 = 8

45 : 5 = 9

54 : 6 = 9

63 : 7 = 9

72 : 8 = 9

A

A

A

24^54 x 54^24 x 2^10=(2^3.3)^5 x (3^3.2)^24... 

=(2^3)^54 x 3^54 x (3^3)^24 x 2^24 x 2^10 

= 2^162 x 2^24 x 2^10 x 3^54 x 3^72 

=2^196 x 3^126 

72^63=(2^3 x 3^2)^63 

=(2^3)^63 x (3^2)^63= 2^18 x 3^126 

Vì  2^196 x 3^126 chia hết 2^189 x 3^126 

=>24^54 x 54^24 x 2^10 chia hết 72^63 

\(24^{54}.54^{24}.2^{10}=\left(2^3.3\right)^{54}.\left(2.3^3\right)^{24}.2^{10}=2^{162}.3^{54}.2^{24}.3^{72}.2^{10}=2^{196}.3^{126}\)

\(72^{63}=\left(2^3.3^2\right)^{63}=2^{189}.3^{126}\)

Mà \(2^{196}.3^{126}⋮2^{189}.3^{126}\Rightarrow24^{54}.54^{24}.2^{10}⋮72^{63}\)