1.Tính nhanh : 13 x 2525 - 25 x 1313
2. Tìm X : ( 4 x X - 2 ) x ( 2024 - X ) = X
\(P\left(x\right)\)=\(x^{2023}-2024.x^{2022}+2024.x^{2021}-2024.x^{2020}+.....+2024.x-1\)
tính P ( 2023)
Giải nhanh giúp mik ạ !! đang cânf gấp O(∩_∩)O
Với x = 2023
<=> x + 1 = 2024
Khi đó P(2023) = x2023 - (x + 1).x2022 + ... + (x + 1).x - 1
= x2023 - x2023 - x2022 + .. + x2 + x - 1
= x - 1 = 2023 - 1 = 2022
X-7 = -5 (x+2) = 0 (3x - 24) . 73 =2.74 | x - 5 | = |-7| x- [42 + ( -28) = -8 ( 7x - x ) - ( 25+7 ) = -25 |x-3| = |5| + | -7 | ( x : 3-4 ) : 5 =15 | x -3 | = 7 - (-2) 128 -3 . (x+4) = 23 4 - ( 7-x ) = x - (13-4 ) BÀI 2 : TÍNH NHANH S1 = 1+2+3+.......999 S1= 10 +12 + 14 +.......2010 S3 + 21 + 23 + 25 + .......10001
tính nhanh
(2022 x 2023 + 2024 x 21 + 2002 ) :( 2024 x 2023 - 2022 x 2023 )
Phân tích thành nhân tử:
a) (x+y)^2-(x-y)^2
b) (3x+1)^2-(x+1)^2
Tính nhanh:
a) 25^2-15^2
b)87^2+73^2-27^2-13^2
Tìm x:
a) x^3-0.25.x=0
b) x^2-10= -25
c) 4.x^2-4.x=-1
d)8x^3+12.x^2+6.x+1=0
Tính nhanh :
a) 252 - 152 = (25 + 15)(25 - 15) = 40 . 10 = 400
b) 872 + 732 - 272 - 132 = (872 - 132) + (732 - 272)
= (87 + 13)(87 - 13) + (73 + 27)(73 - 27)
= 100 . 74 + 100 . 26 = 100 . (74 + 26) = 100 . 100 = 10000
Bài 1:
a)\(\left(x+y\right)^2-\left(x-y\right)^2=\left(x+y+x-y\right)\left(x+y-x+y\right)=2x\cdot2y=2\left(x+y\right)\)
b) \(\left(3x+1\right)^2-\left(x+1\right)^2=\left(3x+1+x+1\right)\left(3x+1-x-1\right)\\ =\left(4x+2\right)\cdot2x=4x\left(2x+1\right)\)
Bài 2:
a) \(25^2-15^2=\left(25-15\right)\left(25+15\right)=10\cdot40=400\)
b) \(87^2+73^2-27^2-13^2=\left(87^2-27^2\right)+\left(73^2-13^2\right)\\ =\left(87-27\right)\left(87+27\right)+\left(73-13\right)\left(73+13\right)\)
\(=60\cdot114+60\cdot86=60\cdot\left(114+86\right)=60\cdot200=12000\)
Bài 2:
a) \(x^3-0,25\cdot x=0\)
\(\Leftrightarrow x^2\left(x-0,25\right)=0\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x-0,25=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=0,25\end{array}\right.\)
b) \(x^2-10=-25\)
\(\Leftrightarrow x^2=-15\) (vô nghiệm0
c) \(4x^2-4x=-1\)
\(\Leftrightarrow4x^2-4x+1=0\)
\(\Leftrightarrow\left(2x-1\right)^2=0\)
\(\Leftrightarrow2x-1=0\Leftrightarrow x=\frac{1}{2}\)
d) \(8x^3+12x^2+6x+1=0\)
\(\Leftrightarrow\left(2x+1\right)^3=0\)
\(\Leftrightarrow2x+1=0\Leftrightarrow x=-\frac{1}{2}\)
Phân tích thành nhân tử :
a) (x + y)2 - (x - y)2 = [(x + y) + (x - y)][(x + y) - (x - y)]
= 2x . 2y = 4xy
b) (3x + 1)2 - (x + 1)2 = [(3x + 1) + (x + 1)][(3x + 1) - (x - 1)]
= (4x + 2)(2x + 2) = 4 . (2x + 1)(x + 1)
tính nhanh :
a , 3/5 + 25 - 1/5
b , 13 x 3 x 32,27 + 67,63 x 39
c , ( 1-1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x............. x ( 1 - 1/100 )
AI NHANH MÌNH TICK
(1-1/2) x (1-1/3) x .... x (1-1/100)
= 1/2 x 2/3 x ... x 99/100
= 1x2x...x99/2x3x..x100
= 1/ 100
a, \(\frac{3}{5}+25-\frac{1}{5}\)
\(=\left(\frac{3}{5}-\frac{1}{5}\right)+25\)
\(=\frac{2}{5}+25\)
\(=25\frac{2}{5}\)
\(=25,4\)
b, \(13.3.32,27+67,63.39\)
\(=39.32,27+67,63.39\)
\(=39\left(32,37+67,63\right)\)
\(=39.100\)
\(=3900\)
c, \(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)....\left(1-\frac{1}{100}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}......\frac{99}{100}\)
\(=\frac{1}{100}\)
tìm x,y nguyên 25-y^=8.|x-2024|^2
tìm x thuộc z biết x + (x+1) + (x+2) + ... + 2023 + 2024 = 2024
\(x+\left(x+1\right)+\left(x+2\right)+...+2023+2024=2024\)
\(\Rightarrow2023x+4090506=2024-2024-20232023\)
\(\Rightarrow x+4090506=-2023\)
\(\Rightarrow2023x=-2023-4090506\)
\(\Rightarrow2023x=-4092529\)
\(\Rightarrow x=-2023\).
bài 1 tính gt biểu thứca, 25 x 16 13 270 3b, 273 485 x 16 483 3 x 4c, 78 22 x 96 3 20 d, 779 41 x 16 x 435 249 bài 2 tính nhanh a, 137 x 6 63 x 6 200 x 4 b. 42 x 43 43 x 57 43c, 754 x 75 2262 x 25 4568
lấy máy tính ra bấm, không rảnh!!!!!!!
lớp 1 đã học cái này rồi à ?
lớp 1 đẵ học cái này rồi à
Biết: x + (x - 1) - (x - 2) + (x - 3) - (x - 4) +.....+ (x - 2023) - (x -2024) =0
Vậy x =?
A. 0
B. -1011
C. -1012
D. -2024