tính : F =[2.3012] /[1+1/(1+2) +1/(1+2+3)+.....+1/(1+2+...+3012)]
A= 1-|2x-3|
B= |x-3|-|5-x|
C=4-|5x+2|-|3y+12|
D=5-3(x+1)^2
E=1/2(x+1)^2+3
F=15/4+3|x-1|
G=2021/2020+2019(x-2108)^2
B1:Tính
a)(-2/3+3/7):4/5+(-1/3+4/7):4/5
b)5/9:(1/11-5/22)+5/9:(1/15-2/3)
c)4^2.4^3/4^10
d)(0,6)^5/(0,2)^6
e)2^7.9^3/6^5.8^2
g)6^3+3.6^2+3^3/-13
h)(3/7+1/2)^2
i)(3/4-5/6)^2
k)5^4.20^44/25^5.4^5
l)(-10/3)^5.(-6/5)^4
f)(1+2/3-1/4).(4/5-3/4)^2
m)2:(1/2-2/3)^3
n)9.9.(-1/3)^3+1/3
y)(4.2^5):(2^3.1/16)
Tính : D = 1/3 + 1/3^2 + 1/3^3 + ... + 1/3^2024
Bài 3: Tính giá trị của:
a) M = 1002 - 992 + 982 - 972 + ... + 22 - 12;
b) N = (202 + 182 + 162 + ... + 42 + 22) - (192 + 172 + 152 + ... + 32 + 12);
c) P = (-1)n.(-1)2n+1.(-1)n+1.
Bài 13: Tìm x biết:
a) (x - 1)3 = 27; e) 5x + 2 =625;
b) x2 + x = 0; f) (x - 1)x + 2 = (x - 1)x + 4;
c) (2x + 1)2 = 25; g) (2x - 1)3 = -8;
d) (2x - 3)2 = 36; h) 1/4 . 2/6 . 3/8 . 4/10 . 5/12 ... 30/62 . 31/64 = 2x.
Giúp mình với, đang cần gấp >_<
Tính :
\(\left(-\dfrac{1}{2}\right)^0;\left(3\dfrac{1}{2}\right)^2;\left(2,5\right)^3;\left(-1\dfrac{1}{4}\right)^4\)
Cho Sn=1-2+3-4+...+(-1)n-1.n với n=1,2,3,...
Tính S35+S60
Tính nhanh :
1)A=\(\frac{1}{2}-\frac{1}{2^2}+\frac{1}{2^3}-...+\frac{1}{2^{99}}-\frac{1}{2^{100}}\)
2)B=\(\frac{1}{2}+\frac{1}{2^3}+\frac{1}{2^5}+...+\frac{1}{2^{99}}\)
3)C=\(\frac{1}{2}-\frac{1}{2^4}+\frac{1}{2^7}-\frac{1}{2^{10}}+...-\frac{1}{2^{58}}\)