Question

Tìm UCLN của
a) 32; 128 
b) 42; 30
c) 16;32;128
d)42; 30; 20

Answer 1

`a, 32 = 2^5, 128 = 2^7 => (32, 128) = 32`

`b, 42 = 2 xx 3 xx 7, 30 = 2 xx 3 xx 5 => (42, 30) = 6`

`c, 16 = 2^4, 32 = 2^5, 128 = 2^7 => (16, 32, 128) = 16`

`d, 42 = 2 xx 3 xx 7, 30 = 2 xx 3 xx 5, 20 = 2^2 xx 5 => (42, 30, 20) = 2`.

Answer 2

Lời giải:
a.

$32=2^5$

$128=2^7$

$\Rightarrow ƯCLN(32,128)=2^5=32$

b.

$42=2.3.7$

$30=2.3.5$

$\Rightarrow ƯCLN(42,30)=2.3=6$

c.

$16=2^4$

$32=2^5$

$128=2^7$

$\Rightarrow ƯCLN(16,32,128)=2^4=16$

d.

$42=2.3.7$

$30=2.3.5$

$20=2^2.5$

$\Rightarrow ƯCLN(42,30,20)=2$

Answer 3

\(a,32;128\)

\(32=2^5\)  \(128=2^7\)

\(ƯCLN\left(32;128\right)=2^5=32\:\)

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\(b,42;30\)

\(42=2.3.7\)  \(30=2.3.5\)

\(ƯCLN\left(42;30\right)=2.6=6\)

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\(c,16;32;128\)

\(16=4^2\)  \(32=2^5\)  \(128=2^7\)

\(ƯCLN\left(16;32;128\right)=2^4=16\)

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\(d,42;30;20\)

\(42=2.3.7\)  \(30=2.3.5\)  \(20=2^2.5\)

\(ƯCLN\left(42;30;20\right)=2\)