ƯCLN(5,6)
a) = 5,6 b)=48 c) = 5,6x(4+3+1)=5,6x7=39,2
d)=0
5,6 . 10 -2 kJ = ...... MJ ( Mega joule)
5,6 . 10 6 nJ = ...... GJ
5,6 . 10 -10 kJ = ...... mJ
5,6 . 10 -2 J = ...... nJ
5,6 . 10 20 J = ...... TJ
tính nhanh a] 5,6 x 4 + 5,6 x 3 +5,6 x 2 +5,6=
b] \(\dfrac{45x32x21}{9x3x7x8x4}\)
a) \(=5,6\cdot\left(4+3+2+1\right)\\ =5,6\cdot10=56\)
b) \(=5\)
a)5,6 x 4 + 5,6 x3 + 5,6 x 2 + 5,6
=5,6x(4+3+2+1)
=5,6x10
=56
b) =5
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
\(ƯCLN(33,55)\)
\(33 = 3.11\)
\(55 = 5.11\)
\(ƯCLN(33,55) = 11\)
\(ƯCLN(105,210)\)
\(105 = 5.3.7\)
\(210 = 2.5.3.7\)
\(ƯCLN(105,210) = 5.3.7 = 105\)
\(ƯCLN(48,90)\)
\(48 = 2^4.3\)
\(90 = 2.5.3^2\)
\(ƯCLN(48,90) = 3.2 = 6\)
\(ƯCLN(48,60,120)\)
\(48 = 2^4.3\)
\(60 = 2^2.3.5\)
\(120 = 2^3.3.5\)
\(ƯCLN(48,60,120) = 2^2.3 = 4.3 = 12\)
\(ƯCLN(45,60)\)
\(45 = 3^2.5\)
\(60 = 2^2.3.5\)
\(ƯCLN(45,60) = 3.5 = 15\)
chứng minh: ƯCLN(k.a; k.b)=k.ƯCLN(a;b)
và chứng minh: ƯCLN( a;b;c)= ƯCLN( ƯCLN (a;b);c)= ƯCLN( ƯCLN (a;c);b)=ƯCLN( ƯCLN (b;c);a)
9 TÌM: ƯCLN ( 84 ; 105 ) ƯCLN ( 16 ; 24)
ƯCLN ( 40 ;144) ƯCLN (56; 140)
ƯCLN (52;42;48) ƯCLN (135 ;225;405)
ƯCLN (128;190 ;320)
GIUP MINH VOI DANG GAP
ƯCLN(84;105)=21
ƯCLN(16;24)=8
ƯCLN(40;144)=8
ƯCLN(52;42;48)=2
ƯCLN(135;225;405)=45
ƯCLN(128;190;320)=2
a: 84=2^2*3*7; 105=3*5*7
=>ƯCLN(84;105)=3*7=21
b: 16=2^4; 24=2^3*3
=>ƯCLN(16;24)=2^3=8
c: 40=2^3*5; 144=2^3*3^2
=>ƯCLN(40;144)=2^3=8
d: 56=2^3*7; 140=2^2*5*7
=>ƯCLN(56;140)=2^2*7=28
e: 52=2^2*13; 42=2*3*7; 48=2^4*3
=>ƯCLN(52;42;48)=2
f: 135=5*3^3; 225=5^2*3^2; 405=3^4*5
=>ƯCLN(135;225;405)=5*3^2=5*9=45
g: 128=2^7; 190=2*5*19; 320=2^6*5
=>ƯCLN(128;190;320)=2
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
5,6 x 7,5 - 5,6 x 4,5 + 5,6 - 3 x 5,6 = ?
nhanh giúp mình nha
\(5,6\cdot7,5-5,6\cdot4,5+5,6-3\cdot5,6\)
\(=5,6\left(7,5-5,6+1-3\right)\)
\(=5,6\cdot\left(-0,1\right)\)
\(=-0,56\)
= 5,6 x 7,5 - 5,6 x 4,5 + 5,6 x1 - 3 x 5,6
= 5,6 x ( 7,5 - 4,5 + 1 - 3 )
= 5,6 x 1
= 5,6
Chúc bạn hok tốt !
TÍNH CÁCH THUẬN TIỆN NHẤT
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