Bài 1: Tìm:
a. ƯCLN(45,60)
b. ƯCLN(48,72,90)
c. ƯCLN(132,214,318)
d. ƯCLN(210,420,980) giúp mìn với.
Tìm:
a) ƯCLN(1,16);
b) ƯCLN(8, 20);
c) ƯCLN (84, 156);
d) ƯCLN (16, 40, 176).
a) ƯCLN(1,16) = 1.
b) 8 = 23; 20 = 22.5
=> ƯCLN(8, 20) = 22 = 4.
c) 84 = 22. 3.7; 156 = 22.3.13
=> ƯCLN(84, 156) = 22.3 = 12.
d) 16 = 24; 40 = 23.5; 176 = 24.11
=> ƯCLN(16, 40, 176) = 23 = 8.
8. Tìm:
a) ƯCLN (24; 108)
b) ƯCLN (60; 72)
c) ƯCLN (96; 192)
d) ƯCLN (24; 36; 160)
a: UCLN(24;108)=12
b: UCLN(60;72)=12
c: UCLN(96;192)=96
d: UCLN(24;36;160)=4
8. Tìm:
a) ƯCLN (24; 108)
b) ƯCLN (60; 72)
c) ƯCLN (96; 192)
d) ƯCLN (24; 36; 160)
\(a,24=2^3\cdot3;108=2^2\cdot3^3\\ \RightarrowƯCLN\left(24,108\right)=2^2\cdot3=12\\ b,60=2^2\cdot3\cdot5;72=2^3\cdot3^2\\ \RightarrowƯCLN\left(60,72\right)=2^2\cdot3=12\\ c,96=2^5\cdot3;192=2^6\cdot3\\ \RightarrowƯCLN\left(96,192\right)=2^5\cdot3=96\\ d,24=2^3\cdot3;36=2^2\cdot3^2;160=2^5\cdot5\\ \RightarrowƯCLN\left(24,36,160\right)=2^2=4\)
a,24=23⋅3;108=22⋅33⇒ƯCLN(24,108)=22⋅3=12b,60=22⋅3⋅5;72=23⋅32⇒ƯCLN(60,72)=22⋅3=12c,96=25⋅3;192=26⋅3⇒ƯCLN(96,192)=25⋅3=96d,24=23⋅3;36=22⋅32;160=25⋅5⇒ƯCLN(24,36,160)=22=4
ƯCLN(33,55)
ƯCLN(48,90)
ƯCLN(105,210)
ƯCLN(48,60,120)
ƯCLN(45,60)
ƯCLN(33,55)=11
ƯCLN(48,90)=6
ƯCLN(105,210)=105
ƯCLN(48,60,120)=12
ƯCLN(45,60)=15
\(ƯCLN(33,55)\)
\(33 = 3.11\)
\(55 = 5.11\)
\(ƯCLN(33,55) = 11\)
\(ƯCLN(105,210)\)
\(105 = 5.3.7\)
\(210 = 2.5.3.7\)
\(ƯCLN(105,210) = 5.3.7 = 105\)
\(ƯCLN(48,90)\)
\(48 = 2^4.3\)
\(90 = 2.5.3^2\)
\(ƯCLN(48,90) = 3.2 = 6\)
\(ƯCLN(48,60,120)\)
\(48 = 2^4.3\)
\(60 = 2^2.3.5\)
\(120 = 2^3.3.5\)
\(ƯCLN(48,60,120) = 2^2.3 = 4.3 = 12\)
\(ƯCLN(45,60)\)
\(45 = 3^2.5\)
\(60 = 2^2.3.5\)
\(ƯCLN(45,60) = 3.5 = 15\)
1) a)ƯCLN(45;60)
b)ƯCLN(48;72;90)
c)ƯCLN(132;214;318)
d)ƯCLN(210,420,980)
2.Một lớp học có 28 nam và 24 nữ .Có bao nhiêu cách chia tổ cho số nam ,số nữ bằng nhau trong mỗi tổ ?Cách chia nào để mỗi tổ có số học sinh ít nhất ?
3.Trong 10 số tự nhiên từ 50 đến 59 thì những cặp số nào là nguyên tố cùng nhau?
1) a) 45 = 32.5
60 = 22.3.5
=> UCLN(45,60) = 3.5 = 15
b) UCLN(48;72;90) = 6
c) 2
d) 70
Đề bài: Tìm ƯCLN
a, ƯCLN ( 16, 24 )
b, ƯCLN ( 60, 90 )
c, ƯCLN ( 24, 84 )
d, ƯCLN ( 16, 60 )
e, ƯCLN ( 18, 77 )
g, ƯCLN ( 18, 90 )
h, ƯCLN ( 18, 30, 42 )
k, ƯCLN ( 26, 39, 48 )
a) ƯCLN ( 16, 24 )
16 = 23 24 = 22.3
ƯCLN ( 16;24 ) = 22= 4
b) ƯCLN ( 60, 90 )
60 = 22.3.5 90=2.32.5
ƯCLN ( 60;90 ) = 2.3.5 = 30
c) ƯCLN ( 24, 84 )
24 = 23.3 84 = 22.3.7
ƯCLN ( 24;84 ) = 22.3 = 12
d) ƯCLN ( 16, 60 )
16 = 24 60 = 22.3.5
ƯCLN ( 16;60 ) = 22=4
e) ƯCLN ( 18, 77 )
18 = 2.32 77=7.11
ƯCLN ( 18; 77 ) = 1
g) ƯCLN ( 18, 90 )
18 = 2.32 90=2.32.5
ƯCLN ( 18;90 ) = 2.32 = 18
h) ƯCLN ( 18, 30, 42 )
18 = 2.32 30 = 2.3.5 42 = 2.3.7
ƯCLN ( 18;30;42 ) = 2.3=6
k) ƯCLN ( 26, 39, 48 )
26 = 2.13 39 = 3.13 48 = 24.3
ƯCLN ( 26;39;48 ) = 1
Đề bài: Tìm ƯCLN
a, ƯCLN ( 18, 24 )
b, ƯCLN ( 24, 36 )
c, ƯCLN ( 16, 80, 176)
d, ƯCLN ( 6, 8, 18 )
e, ƯCLN ( 24, 80, 184 )
g, ƯCLN (56, 140 )
h, ƯCLN ( 12, 14, 8 ,20 )
k, ƯCLN ( 7, 9, 12, 21 )
a) ƯCLN ( 18, 24 )
18 = 2.33 24 = 23.3
ƯCLN ( 18;24 ) = 2.3 = 6
b) ƯCLN ( 24, 36 )
24 = 23.3 36 = 22.32
ƯCLN ( 24;36 ) = 22.3 = 12
c) ƯCLN ( 16, 80, 176)
16 = 24 80 = 24.5 176 = 24.11
ƯCLN ( 16;80;176 ) = 24 =16
d) ƯCLN ( 6, 8, 18 )
6 = 2.3 8 = 23 18 = 2.32
ƯCLN ( 6;8;18 ) = 2
e) ƯCLN ( 24, 80, 184 )
24 = 23.3 80 = 24.5 184 = 23.23
ƯCLN ( 24;80;184 ) = 23 = 8
g) ƯCLN (56, 140 )
56 = 23.7 140 = 22.5.7
ƯCLN ( 56;140 ) = 22.7 = 28
h) ƯCLN ( 12, 14, 8 ,20 )
12 = 22.3 14 = 2.7 8 = 23 20 = 22.5
ƯCLN ( 12;14;8;20 ) = 2
k)ƯCLN ( 7;9;12;21 )
7 = 7 9 = 32 12 = 22.3 21 = 3.7
ƯCLN ( 7;9;12;21 ) = 1
Tìm:
a) ƯCLN (215, 75);
b) BCNN (45, 72).
Bấm tổ hợp phím:
a) ALPHA X 215 SHIFT ) 75 =
Kết quả: 5
b) ALPHA : 45 SHIFT ) 72 =
Kết quả: 360
a) ƯCLN (12,15) e) BCNN(20,30)
b) ƯCLN(18,42) f) BCNN( 84,108)
c) ƯCLN(24,36,40) g)BCNN(45,150)
d) ƯCLN(150,84,30) h) BCNN(12,15,10)
giúp e vs!
\(a,ƯCLN\left(12,15\right)=3\\ b,ƯCLN\left(18,42\right)=6\\ c,ƯCLN\left(24,36,40\right)=2\\ d,ƯCLN\left(150,84,30\right)=6\\ e,BCNN\left(20,30\right)=60\\ f,BCNN\left(84,108\right)=756\\ g,BCNN\left(45,150\right)=450\\ h,BCNN\left(12,15,10\right)=60\)