4(\(\frac{-1}{2}\))2 +2 (\(\frac{-1}{2}\))2 - 3(\(\frac{1}{2}\))0
= (\(\frac{-1}{2}\))2 . (4+2) - 3.1
= \(\frac{1}{4}\).6 - 3
= \(\frac{3}{2}\)-3 =\(\frac{3}{2}\)-\(\frac{6}{2}\)=\(\frac{-3}{2}\)
10 Rút gọn:
a) A= 1+2+22+23+24+...+249+250
b) B= \(\dfrac{1}{2}+(\dfrac{1}{2})^2+(\dfrac{1}{2})^3+(\dfrac{1}{2})^4+(\dfrac{1}{2})^5+...+(\dfrac{1}{2})^{99}+(\dfrac{1}{2})^{100}\)
Tìm x biết :
1. x^2-3/5x=0
2./x-4/5/=1/10
3./x-1/5/-(-1/3)^2=(-2)^3
4.11/3x-1=2.(x+2/11)
1. So sánh:
a) 25^50 và 2^300
b) 625^15 và 12^45
2. Tính hợp
a) -4 5/7 . 33 1/3 + 4 5/7 . 47 . 1/3
b) (3/5 + 5 2/3 ) : 121/19 + ( -5 2/3 + 2/3 ) : 121/19
c)( -1/4) . ( 6 2/11) + 3 9/11 . (-1/4)
d) 4 . ( -1/3)^3 - 2 . ( -1/2)^2 + 3. (-1/2) +1
3. Tìm x
a) GTTĐ của x - 2 = 5
b) 3x . ( x - 2/5) = 0
c) 3 ^x+2 +3^x = 270
d) 3/4 + 1/4 :x = 2/5
e) (9/5 - x)^2 = 16/25
1)tính
S=2^2+4^2+6^2...+20^2 biet 1^2+2^2+3^2+...+10^2=385
2)tính
A=2^0+2^1+2^3+...+2^100
Bài 1 tính .
a) \(\dfrac{\left(-3\right)^{10}.15^5}{25^3.\left(-9\right)^7}\)
b) 2\(^3\) +3 . (\(\dfrac{1}{9}\))\(^0\) -2\(^{-2}\) . 4 +[ (-2)\(^2\) : \(\dfrac{1}{2}\) ] . 8
Giúp mình với mình cảm ơn
\(\frac{2^{-2}-\left(-\frac{3}{4}\right)^{-4}.\left(\frac{-1}{2}\right)^2}{10^{-1}^{ }+\left(\frac{1}{8\left(\right)^0}\right)}\)
a) |4-x|+2x=3
b) |x+1|+|x+2|+|x+3|=4x
c) |2x-1|=2
d) |3-2x|+|4y+5|=0
e)x^2+|x-1|=x^2+2
ìm x,y,z thuộc Q:
a)|x+9/2|+|y+4/3|+|z+7/2| nhỏ hơn hoặc bằng 0
b)|x+3/4|+|y-2/5|+|z+1/2| nhỏ hơn hoặc bằng 0
c) |x+19/5|+|y+1890/1975|+|z-2004|=0
d) |x+3/4|+|y-1/5|+|x+y+z|=0
Thực hiện phép tính (tính nhanh nếu có thể):
4) \(4\cdot\left(\dfrac{-1}{2}\right)^3+\left|-1\dfrac{1}{2}+\sqrt{\dfrac{9}{4}}\right|:\sqrt{25}\)
5) \(\left[6-3\cdot\left(\dfrac{-1}{3}\right)^2+\sqrt{\dfrac{1}{4}}\right]:\sqrt{0,\left(9\right)}\)
