ai đề toán lớp 6 ko vậy cho mk xin cô mk chưa phát đề help mk nhé
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60=2^2.3.5
504=2^3.3^2.7
ƯCLN(60,504)=2^2.3=12
Vậy số tự nhiên a là 12
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[1800 - (4^3- 18 . 3)^3] : 8 + 22
= [1800 - (64 - 54)^3] : 8 + 22
= [1800 - 10^3] : 8 + 22
= [1800 - 1000] : 8 + 22
= 800 : 8 + 22
= 100 + 22
= 122
mình ko biết có đúng ko,sai thì mình hông nhận gạch đá , cảm ơn
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Ta phân tích :
\(16=2^4\)
\(24=2^2.3.2\)
\(40=2^3.5\)
\(\text{ƯCLN }\left(16;24;40\right)=2^2=4\)
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Ta có : 300 = 22. 3.52
240 = 24 .3.5
420 = 22.3.5.7
ƯCLN ( 300;240;420) = 22 . 3 . 5 = 60
\(300=2^2.3.5^2\)
\(240=2^4.3.5\)
\(420=2^2.3.5.7\)
\(UCLN\left(300;240;420\right)=2^2.3.5=60\)
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LG
vì \(\orbr{\begin{cases}x⋮15\\x⋮20\end{cases}\Rightarrow\orbr{\begin{cases}x\in B\left(15\right)\\x\in B\left(20\right)\end{cases}\Rightarrow}x\in BC\left(15;20\right)}\)
Ta có
15=3.5
20=22.5
\(\Rightarrow BCNN\left(15;20\right)=2^2.3.5=60\)
\(\Rightarrow x\in B\left(60\right)=\left\{0;60;120;180;...\right\}\)
mà 50<x,70
=>x=60
vậy x=60
10999999