=10344

\(=10344\)

X=7778+1912

X=9690

X=9690x8

X=77520

X=77520:3

X=25840

vậy X=25840

X x 3:8 - 1912 = 7778

X                   = 7778 + 1912

X                   = 9690

X                   =9690 x 8

X                   = 77520

X                   = 77520:3

X                   = 25840

Đáp số : X = 25840

bạn chép rõ ràng đi. minh giai cho

x * 3 : 8 - 1912 = 7778

x * 3 : 8           = 7778 + 1912

x * 3 : 8           =       9690

x * 3                =   9690 * 8

x * 3                =     77520

x                     =  77520 : 3

x                     =      25840

886675221

7778+7878787+878787878+777+1=886675221

k nha!

Ta có 776 ≡   1 (mod 5)  => 776^776 ≡     1 (mod 5)

           777 ≡ - 3 (mod 5)  =>  777^777 ≡ - 3777 (mod 5)

           778 ≡    3 (mod 5) =>  778^778 ≡    3778 (mod 5)

=> 776^776 + 777^777 + 778^778 ≡ 1 - 3^777 + 3^778 (mod 5)

Hay 776^776 + 777^777 + 778^778 ≡ 1 + 3.3^777 - 3^777 (mod 5)

776^776 + 777^777 + 778^778 ≡ 1 + 3^777(3 - 1) (mod 5)

776^776 + 777^777 + 778^778 ≡ 1 + 2.3^777

Mà 3^2 ≡ - 1(mod 3) => (3^2)^388.3 ≡ 3 (mod 5)

Vậy  A = 776^777 + 778^778 ≡  1 + 2.3  ≡  2 (mod 5)

Vậy A chia cho 5 dư 2.

Bạn ơi cái chỗ 776^776+777^777+778^778=1-3^777+3^778 lại là trừ vậy đáng lẽ vế trái cộng thì vế phải cũng phải trừ chứ. Giải thích chỗ đó hộ mình. Thanks.

à thế à

gom vô

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(1111+8889)+(2222+7778)+(4444+5556)

=10000+10000+10000
Đây nha