Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
40=2.2.2.5
52=2.2.13
BCNN=2.2.2.5.13=520
b,30=2.3.5
90=2.3.3.5
BCNN=2.3.3.5=90
a) Ta có: 18=2⋅3^21
24=2^3⋅3
30=2⋅3⋅5
Do đó: ƯCLN(18;24;30)=2⋅3=6 và BCNN(18;24;30)=2^3⋅3^2⋅5=360
b) Ta có: 40=2^3⋅5
75=3⋅5^2
105=3⋅5⋅7105=3⋅5⋅7
Do đó: ƯCLN(40;75;105)=5^1=5 và BCNN(40;75;105)=2^3⋅3⋅5^2⋅7=4200
c) Ta có: 18=2⋅3^2
36=2^2⋅3^2
72=2^3⋅3^2
Do đó: ƯCLN(18;36;72)=2.3^2=2⋅9=18 và BCNN(18;36;72)=2^3⋅3^2=72
a: \(24=2^3\cdot3;40=2^3\cdot5\)
=>\(ƯCLN\left(24;40\right)=2^3=8\)
=>\(ƯC\left(24;40\right)=\left\{1;-1;2;-2;4;-4;8;-8\right\}\)
b: \(12=2^2\cdot3;52=2^2\cdot13\)
=>\(ƯCLN\left(12;52\right)=2^2=4\)
=>\(ƯC\left(12;52\right)=\left\{1;-1;2;-2;4;-4\right\}\)
c: \(45=3^2\cdot5;180=2^2\cdot3^2\cdot5\)
=>\(ƯCLN\left(45;180\right)=3^2\cdot5=45\)
=>\(ƯC\left(45;180\right)=\left\{1;-1;3;-3;5;-5;9;-9;15;-15;45;-45\right\}\)
d: \(27=3^3;45=3^2\cdot5;75=3\cdot5^2\)
=>\(ƯCLN\left(27;45;75\right)=3\)
=>\(ƯC\left(27;45;75\right)=\left\{1;-1;3;-3\right\}\)
Phan h moi so ra TSNT roi nhan len la ra!!
a,ta co:
\(220=2^2.5.11\)
\(240=2^4.3.5\)
\(300=2.3.5^2\)
\(\Rightarrow UCLN\left(220,240,300\right)=2.3.5=30\)
\(BCNN\left(220,240,300\right)=2^4.3.5^2=1200\)
Cac cau con lai tuong tu nha!!
HTDT
a ) Ta có : \(220=2^2\cdot5\cdot11\)
\(240=2^4\cdot3\cdot5\)
\(300=2^2\cdot3\cdot5^2\)
\(\Rightarrow\:ƯCLN\)\(\left(220;240;300\right)=2^2\cdot5=20\)
\(\Rightarrow BCNN\left(220;240;300\right)=2^4\cdot3\cdot5^2\cdot11=13200\)
b) Ta có : \(40=2^3\cdot5\)
\(75=3\cdot5^2\)
\(105=3\cdot5\cdot7\)
\(\RightarrowƯCLN\left(40;75;105\right)=5\)
\(\Rightarrow BCNN\left(40;75;105\right)=2^3\cdot3\cdot5^2\cdot7=4200\)
c)
\(C1:\) Ta có : \(18=2\cdot3^2\)
\(36=2^2\cdot3^2\)
\(72=2^3\cdot3^2\)
\(\Rightarrow\:\)\(ƯCLN\)\(\left(18;36;72\right)=2\cdot3^2\)\(=18\)
\(\Rightarrow BCNN\left(18;36;72\right)=2^3\cdot3^2=72\)
\(C2:\) Vì \(36⋮18;72⋮18;18⋮18\) nên \(\:ƯCLN\)\(\left(18;36;72\right)=18\)
Vì \(72\) chia hết cho \(18;36;72\) nên \(BCNN\left(18;36;72\right)=72\)
a, -(-15+125-81)-(-85+75-19+100)
=-15-125+81-(-85)-75+19-100
=-140+81-(-85)-75+19-100
=-59-(-85)-75+19-100
=-16-75+19-100
=-91+19-100
=-72-100
=-172
a) ƯCLN(30,40,50) = 10
BCNN(30,40,50) = 600
b) ƯCLN(30,45,75) = 15
BCNN(30,45,75) = 450
c) ƯCLN(72,45,52) = 1
BCNN(72,45,52) = 4680
d) ƯCLN(26,39,52) = 13
BCNN(26,39,52) = 156
Chúc bạn học tốt.
a)ta có:
30=2.3.5
40=23.5
50=2.52
=>UCLN(30;40;50)=2.5=10
=> BCNN(30;40;50)=23.3.52=600
b)ta có:
30=2.3.5
45=32.5
75=3.52
=>ƯCLN(30;45;75)=3.5=15
=>BCNN(30;45;75)=2.32.52=450
c)ta có:
72=23.32
45=32.5
52=22.13
=>ƯCLN(72;45;52)=1
=>BCNN(72;45;52)=23.32.5.13=4680
d)ta có:
26=2.13
39=3.13
52=22.13
=>ƯCLN(26;39;52)=13
=>BCNN(26;39;52)=22.3.13=156