Cho A = 13! - 11!
a) A có chia hết cho 2 hay không ?
b) A có chia hết cho 5 hay không ?
c) A có chia hết cho 155 hay không ?
Giải nhanh giúp mình nhé,nhớ ghi lời giải,mình sẽ tick cho!
Cho A = 13! - 11!
a) A có chia hết cho 2 hay không ?
b) A có chia hết cho 5 không ?
c) A có chia hết cho 155 hay không ?
TRẢ LỜI HỘ MÌNH NHA NGAY BÂY GIỜ NHÉ !!!!!!
a) 13! = 13.12.11.....5.4.3.2.1 => 13! chia hết cho 2 và 5
11! = 11.10.9.....5.4.3.2.1 =>11! chia hết cho 2 và 5
=> A chia hết cho 2 và 5
c) A = 13! - 11! = 13.12.11! - 11! = ( 13.12 - 1 ) .11! = 155. 11! chia hết cho 155
Vậy A chia hết cho 155
Phần b) và a) mk gộp vào rồi nhé. Duyệt nha bạn . Chúc bạn học tốt
Ta có:
A = 13! -11!
= 11!(12.13-1)
= 11! . 155
Mà 11! chia hết cho 2, 5 nên A chia hết cho 2 và 5.
Mà 155 chia hết cho 155 nên A chia hết cho 155
A = 13! - 11! = 1 . 2 . 3 . 4 . ...... . 13 - 1 . 2 . 3 . 4 . .... . 11
= 1 . 2 . 3 . 4 . .... . 11 ( 12 . 13 - 1 )
= 1 . 2 . 3 . 4 . .... . 11 ( 156 - 1 )
= 1 . 2 . 3 . 4 . .... . 11 . 155
vì tích trên có chứa thừa số 2 ; 5 ; 155
=> A chia hết cho 2 ; cho 5 ; cho 155
chúc bạn học giỏi
Cho A = 13! - 11!
a) A có chia hết cho 2 hay không ?
b) A có chia hết cho 5 hay không ?
c) A có chia hết cho 155 hay không ?
Cho A=13! -11!
a) A có chia hết cho 2 hay không?
b) A có chia hết cho 5 hay không?
c) A có chia hết cho 155 hay không?
*13! chia hết cho 2
11! chia het cho 2=>13!-11! chia hết cho 2
*13! chia het cho 5
11! chia het cho 5=>3!-11! chia het cho 5
*155=5.31
13! ko chia hết cho 5.31
11! ko chia het cho 5.31=>13!-11! ko chia het cho 155
a)A chia hết cho 2
b)A chia hết cho 5
c)A ko chia het cho 155
**** GIÙM MÌNH NHA
Cho A=13! -11!
a) A có chia hết cho 2 hay không?
b) A có chia hết cho 5 hay không?
c) A có chia hết cho 155 hay không?
a) 13! = 13.12.11....5.4.3.2.1 => 13! chia hết cho 2 và 5
11! = 11.10.9....5.4.3.2.1 => 11! chia hết cho 2 và 5
=> A = 13! - 11! chia hết cho 2 và 5
c) A = 13! - 11! = 13.12.11! - 11! = (13.12 - 1) .11! = 155.11! chia hết cho 155
Vậy A chia hết cho 155
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CHO A = 13! - 11!
A) A CÓ CHIA HẾT CHO 2 HAY KHÔNG ?
B) A CÓ CHIA HẾT CHO 5 HAY KHÔNG ?
C) A CÓ CHIA HẾT CHO 155 HAY KHÔNG ?
\(A=13!-11!\)
\(A=11!\cdot12\cdot13-11!\)
\(A=11!\left(12\cdot13-1\right)\)
\(A=11!\cdot155\)
\(\Rightarrow\)A chia hết cho 2 ( vì trong 11! chứa thừa số 2 )
A chia hết cho 5
A chia hết cho 155
a)A có chia hết cho 2
b)A có chia hết cho 5
c)A có chia hết cho 155
cho A = 13! - 11!
a\ A có chia hết cho 2 hay không
b\A có chia hết cho 5 hay không
c/A có chia hết cho 155 hay không
Cho A=13!-11!.
a)A có chia hết cho 2 hay không?.
b)A có chia hết cho 5 hay không?.
c)A có chia hết cho cả 2 và 5 hay không?
A=13!-11!=6187104000
a) A chia hết cho 2 vì số tận cùng của A là số 0
b) A chia hết cho 5 vì số tận cùng của A là số 0
c)A chia hết cho 2 và 5 vì số tận cùng của A là số 0
Cho A = 13! - 11!
a) A có chia hết cho 2 hay ko ?
b) A có chia hết cho 5 hay ko ?
c) A có chia hết cho 155 hay ko ?
AI GIẢI CHI TIẾT GIÚP MIK MIK SẼ LIKE 3 LIKE !!!!!!!!
giúp mình với:
1/.
a) Tổng của 3 số tự nhiên liên tiếp có chia hết cho 3 hay không?
b) Tổng của 4 số tự nhiên liên tiếp có chia hết cho 4 hay không?
2/. Khi chia số tự nhiên a ta được số dư là 12. Hỏi a có chia hết cho 4 hay không? có chia hết cho 9 không? ( lí luận ra giùm mình nữa nha, nhớ là kết quả nữa. thanks các bạn nhìu!)
1)a)
gọi 3 số đó là a;a+1:a+2
ta có: a+(a+1)+(a+2)=3a+3
mà 3 chia hết cho 3 nên 3a+3 chia hết cho3
b) goij4 số đó là a;a+1;a+2;a+3;a+4
ta có tổng sẽ là: 4a+10
mà 10 ko chia hết cho 4 nên tổng 4 số trên ko chia hết cho 4