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NT
2
B
27 tháng 9 2020
Bài làm :
Ta có :
- 30=2.3.5
- 18=2.32
- 21=3.7
=> BCNN (30;18;21)=2.32.5.7=630
27 tháng 9 2020
\(30=2.3.5\) \(18=2.3^2\) \(21=3.7\)
\(\Leftrightarrow BCNN\left(30;18;21\right)=3^2.2.5.7=630\)
Chúc bạn học tốt
HH
0
NM
4
TL
0
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
| ta co bang sau | |||||||||||||||||||||||
vay ........... | |||||||||||||||||||||||
29 tháng 10 2016
21453
52542000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 | 542454550212.100000000000000000000000000000000000000000000000000000000000000000000000000000 |
3 tháng 8 2016
1/
Ta có :
A = BCNN (1237; 2346; 124) = 179924124
=> A2 = 179924124 x 179924124 = ...
Bài này số lớn quá. ko tính dc
2/
Ta có : A = UCLN (21365; 54678) = 1
B = BCNN (21365; 54678) = 1168195470
Vậy 2A + B = 2 x 1 + 1168195470 = 2 + 1168195470 = 1168195481
Bài này số cũng lớn lắm
DV
1
27 tháng 10 2016
Từ x:y = 4:5 => \(\frac{x}{y}=\frac{4}{5}\) => \(\frac{x}{5}=\frac{y}{4}\) => \(\frac{x}{55}=\frac{y}{44}\)
x:z = 7:11 => \(\frac{x}{z}=\frac{7}{11}\) => \(\frac{x}{11}=\frac{z}{7}\) => \(\frac{x}{55}=\frac{z}{35}\)
=> \(\frac{x}{55}=\frac{y}{44}=\frac{z}{35}\)
Đặt: \(\frac{x}{55}=\frac{y}{44}=\frac{z}{35}=k\Rightarrow\begin{cases}x=55k\\y=44k\\z=35k\end{cases}\)
Lại có BCNN(x,y,z) = 11.5.4.7k = 1540k = 4620 => k = 3
=> \(\begin{cases}x=165\\y=132\\z=105\end{cases}\)
Bài làm :
Ta có ;
Vậy BCNN(40;48;42)=24.3.5.7=1680
\(40=2^3.5\) .
\(48=2^4.3\)
\(42=2.3.7\)
BCNN (40,48,42) = 24.3.5.7=1680
#Satan_Dilys
#9:23_27/9/2020