a) Ta có:
\(24=2^3.3\)
\(10=2.5\)
\(ƯCLN\left(24;10\right)=2\)
\(BCNN\left(24;10\right)=2^3.3.5=120\)
__________
b) Ta có:
\(300=2^2.3.5^2\)
\(280=2^3.5.7\)
\(ƯCLN\left(300;280\right)=2^2.5=20\)
\(BCNN\left(300;280\right)=2^3.3.5^2.7=4200\)
__________
c) Ta có:
\(30=2.3.5\)
\(90=2.3^2.5\)
\(ƯCLN\left(30;90\right)=2.3.5=30\)
\(BCNN\left(30;90\right)=2.3^2.5=90\)
_________
d) Ta có:
\(14=2.7\)
\(21=3.7\)
\(56=2^3.7\)
\(ƯCLN\left(14;21;56\right)=7\)
\(BCNN\left(14;21;56\right)=2^3.3.7=168\)
\(#Wendy.Dang\)
a) có: 24=23 x 3
10= 2 x 5
=> UCLN(24,10)=2
=> BCNN(24,10)= 23 x 3 x 5=8 x 3 x 5= 120
b)300 và 280
có: 300=22 x 3 x 52
280=23 x 5 x 7
=>UCLN(300,280)=22 x 5=4 x 5=20
=>BCNN(300,280)=23 x 3 x 52 x 7=8x3x25x7=4200
c)30 và 90
có: 30=2 x 3 x 5
90=2 x 32 x 5
=>UCLN(30,90)= 2 x 3 x 5=30
=>BCNN(30,90)=2 x 32 x 5=2 x 9 x 5=90
d)có: 14=2 x 7
21=3 x 7
56=7 x 8
=>UCLN(14,21,56)=7
=>BCNN(14,21,56)=2 x 3 x 7 x 8=336
cho mk 1 like nka!!