Tìm hai số tự nhiên a,b biết ƯCLN (a,b)=13 và BCNN(a,b)=195
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NH
1
26 tháng 10 2019
a=13.a′(a′ \in \mathbb{N}∈N),
b = 13.b' (b'b=13.b′(b′ \in \mathbb{N}∈N).
với 1 < a' < b'1<a′<b′. Do 1313 là ƯCLN của aa và bb nên ƯCLN(a', b') = 1(a′,b′)=1.
Ta có:
195195 ⋮ \left(13.a'\right)\Rightarrow \left(195:13\right)(13.a′)⇒(195:13) ⋮ a'\Rightarrow 15a′⇒15 ⋮ a'a′.
195195 ⋮ \left(13.b'\ <(195:13>)(13.b′)⇒(195:13) ⋮ b' > 15b′⇒15 ⋮ b'b′.
Suy ra a', b'a′,b′ là hai ước nguyên tố cùng nhau của 1515.
Dễ thấy, a' = 3, b' = 5a′=3,b′=5 thỏa mãn điều kiện trên với 1 < a' < b'1<a′<b′ và ƯCLN(a', b') = 1(a′,b′)=1.
Vậy a = 13.3 = 39, b =13.5 =65a=13.3=39,b=13.5=65.
8 tháng 12 2015
a) goi hai so la a ; b va a >b
vi UCLN(a,b)=18=>a=18k ; b=18q (trong do UCLN (k,q)=1 va k>q)
=>a+b=162
18k+18q =162
18(k+q)=162
k+q=9
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29 tháng 10 2016
21453
52542000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 | 542454550212.100000000000000000000000000000000000000000000000000000000000000000000000000000 |
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
2 tháng 7 2023
Theo bài ra ta có:
\(\left\{{}\begin{matrix}a=13.k\\b=13.d\end{matrix}\right.\) (k;d)=1;k<d
13.k.13.d = 715,13 =9295
k.d = 9295:13:13 = 55 = 5. 11
⇒k = 5; d = 11
a = 13.5 = 65
b = 13.11 = 143
Kết luận: a = 65; b = 143
GN
0
a bằng 39
b bằng 65