11 x 11 = ???
12 x 11 = ???
21 x 11 =???
d) 12 x 156 - 12 x 55 - 12
e) 12 x 11 + 21 x 11 + 11 x 33
g) 132 x 11 - 11 x 32 - 54 x 11
d) 12x 156 - 12 x 55 - 12
= 12 x ( 156 - 55 - 12 )
= 12 x 100
= 1200
e ) 12 x 11 + 21 x 11 + 11 x 33
= ( 12+ 21 + 33) x 12
= 66 x 11
= 726
g) 132 x 11 - 11 x 32 - 54 x 11
= ( 132 - 32 - 54 ) x 11
= 46 x 11
= 506
d) 12 x 156 - 12 x 55 - 12 = 12x(156 - 55 - 1 ) = 12 x 100 = 1200
e) 12 x 11 + 21 x 11 + 11 x 33 = 11 x ( 12 + 21 + 33 ) = 11 x 66 = 726
g) 132 x 11 - 11 x 32 - 54 x 11 = 11 x ( 132 - 32 - 54 ) = 11 x 46 = 506
d) \(12\times156-12\times55-12\) \(=12\times\left(156-55-1\right)\)
\(=12\times100=1200\)
e) \(12\times11+21\times11+11\times33\)\(=11\times\left(12+21+33\right)=11\times66=726\)
g) \(132\times11-11\times32-54\times11\) \(=11\times\left(132-32-54\right)=11\times46=506\)
Nêu kết quả của biểu thức sau: 12 x 11 + 21 x 11 + 22 x 33 +11
Tính giá trị của các biểu thức sau bằng cách thuận tiện
a) 12 x 11 + 21 x 11 + 11 x 33
b) 132 x 11 – 11 x 32 – 54 x 11
c) 245 x 11 + 11 x 365
d) 78 x 75 + 75 x 89 + 75 x 123
e) 2 x 250 x 50 x 8
g) 1994 x 867 + 1994 x 11
a)12 x 11 + 21 x 11 x 11 + 11 x 33
= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )
= 132+2541+363132+2541+363
= 30363036
b)132x11-11x32-54x11
= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )
=1452−352−594=1452−352−594
= 506506
\(a,=11\times\left(12+21+33\right)=11\times66=726\\ b,=11\times\left(132-32-54\right)=11\times46=506\\ c,=11\times\left(245+365\right)=11\times610=6710\\ d,=75\times\left(78+89+123\right)=75\times290=21750\\ e,=\left(2\times50\right)\times\left(250\times8\right)=100\times2000=200000\\ g,=1994\times\left(867+11\right)=1994\times878=1750732\)
a) 12 x 11 + 21 x 11 + 11 x 33
= 11 x ( 12 + 21 + 33)
= 11 x 66
= 726
b) 132 x 11 - 11 x 32 - 54 x 11
= 11 x ( 132 - 32 - 54)
= 11 x 46
= 506
c) 245 x 11 + 11 x 365
= 11 x ( 245 + 365 )
= 11 x 610 = 6710
d) 78 x 75 + 75 x 89 + 75 x 123
= 75 x ( 78 + 89 + 123)
= 75 x 290 = 21750
e) 2 x 250 x 50 x 8
= (2 x 50) x ( 250 x 8)
= 100 x 2000 = 200000
g) 1994 x 867 + 1994 x 11
= 1994 x ( 867 + 11)
= 1994 x 878 = 1750732
Tìm x nguyên biết |x+1| + (-3) = 17 ?
x = 21 hoặc x = -19
x = -21 hoặc x = 19
x = 11 hoặc x = -12
x = -11 hoặc x = 12
Bài 2: Tìm x, biết:
a) 75 - (x + 11) = 13
b) 29 + (x + 11) = 57
c) 11 + x : 5 = 13
d) 13 + 2(x + 1) = 15
e) 2x + 21 = 41
f) 12 + 3(x – 2) = 60
g) 24x – 11.13 = 11.11
h) 17 – (x – 4) : 2 = 3
c: Ta có: 11+x:5=13
\(\Leftrightarrow x:5=2\)
hay x=10
d: Ta có: \(13+2\left(x+1\right)=15\)
\(\Leftrightarrow2x+2=2\)
\(\Leftrightarrow2x=0\)
hay x=0
e: Ta có: 2x+21=41
\(\Leftrightarrow2x=20\)
hay x=10
f: Ta có: \(12+3\left(x-2\right)=60\)
\(\Leftrightarrow3\left(x-2\right)=48\)
\(\Leftrightarrow x-2=16\)
hay x=18
g: Ta có: \(24x-11\cdot13=11\cdot11\)
\(\Leftrightarrow24x=11\cdot24\)
hay x=11
h: Ta có: \(17-\left(x-4\right):2=3\)
\(\Leftrightarrow\left(x-4\right):2=14\)
\(\Leftrightarrow x-4=28\)
hay x=32
Mọi người ơi help me !\
Bài 1:
a) 11 x 62 + (- 12 ) x 11 + 50 +11
b) 5/ 13 + -5 / 7 + -20 /41 + 8/ 13 + -21 / 41
11×[(62+(-12)]+50+11
11×51+50+11
561+50+11
611+11
622
(5/13+8/13)+(-20/41+-21/41)+-5/7
1+-1+-5/7
-5/7
a)
11 x 62 + -12 x 11 + 50 + 11
= 11 x (62 + -12) + 50 + 11
= 11 x 50 + 50 + 11
= (11 + 11) x (50 + 50)
= 22 x 100
= 2200
b)
5/13 + -5/7 + -20/41 + 8/13 + -21/41
= (5/13 + 8/13) + (-20/41 + -21/41) + -5/7
= 1 + -1 + -5/7
= -5/7
X/2018-1/70-1/15-1/21-...-1/120=5/8
(11/12+11/12.23+11/23.34+....+2/89.100)+x=5/3
(2'11.13+2/13.15+...+2/19.21)-x+4+221/231=7/3
b: \(\Leftrightarrow1-\dfrac{1}{12}+\dfrac{1}{12}-\dfrac{1}{23}+\dfrac{1}{23}-\dfrac{1}{34}+...+\dfrac{1}{89}-\dfrac{1}{100}+x=\dfrac{5}{3}\)
=>x+99/100=5/3
=>x=5/3-99/100=203/300
c: \(\Leftrightarrow\left(\dfrac{1}{11}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{15}+...+\dfrac{1}{19}-\dfrac{1}{21}\right)-x+4+\dfrac{221}{231}=\dfrac{7}{3}\)
\(\Leftrightarrow\dfrac{10}{231}-x+4+\dfrac{221}{231}=\dfrac{7}{3}\)
=>5-x=7/3
hay x=8/3
Tìm số nguyên x, biết: a) 12 + (2x - 11) = 53; b) 21 - (-6+ 3x) = 9 c) - (2x + 4) + 11 = -27; d) 33 - (33 - x) = 0
Tính :
a) 12 x 11 = ………………
25 x 11 = ………………
31 x 11 = ………………
b) 83 x 11 = ………………
58 x 11 = ………………
79 x 11 = ………………
Hướng dẫn giải:
a) 12 x 11 = 132
25 x 11 = 275
31 x 11 = 341
b) 83 x 11 = 913
58 x 11 = 638
79 x 11 = 869