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 !!!!!!
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!
Có : 13! - 11! = 6187104000
a) A chia hết cho 2
b) A chia hết cho 5
c) A chia hết cho 155
Rảnh ~~~
Ta có: 13! = 1x2x3x...x13
11! = 1x2x3x...11
==>13! - 11! = 2(1x3x...13 - 1x3x...11) chia hết cho 2
Tương tự ta có chia hết cho 5 cũng như trên
c/ 13! - 11! = 1x2x3x...x11(12x13-1) = 1x2x3x...x11 x 155 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 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 không ?
b) A có chia hết cho 5 không ?
c) A có chia hết cho 155 không ?
A=13!-11!
A=1.2.3....12.13-1.2.3....10.11
A=618 710 400
a)A chia hết cho 2 ( vì có số cuối là 0)
b)A chia hết cho 5( vì có số cuối là 0)
C)A chia hết cho 155( vì a>155 và 155=5.31)
Cho A = 13! - 11!
a) A có chia hết cho 2 không ?
b) A có chia hết cho 5 không ?
c) A có chia hết cho 155 không ?
\(A=13!-11!=1.2.3.4.5.6.7.8.9.10.11.12.13-1.2.3.4.5.6.7.8.9.10.11\)
a) \(13!⋮2\)\(11!⋮2\)\(\Rightarrow A⋮2\)
b) \(13!⋮5\)\(11!⋮5\)\(\Rightarrow A⋮5\)
c) \(A=13!-11!=1.2.3.4.5.6.7.8.9.10.11.12.13-1.2.3.4.5.6.7.8.9.10.11\)
\(=1.2.3.4.5.6.7.8.9.10.11.\left(12.13-1\right)\)
\(=1.2.3.4.5.6.7.8.9.10.11.155\)
\(\text{}\Rightarrow A⋮155\)