Ta có : $-2<x\leq 1$
\(=>x\in\left\{-1;0;1\right\}\)
Ta có : $-2<x\leq 1$
\(=>x\in\left\{-1;0;1\right\}\)
A = 1 + 1 x 2 + 1 x 2 x 3 + 1 x 2 x 3 x 4 + 1 x 2 x 3 x 4 x 5 + ........... + 1 x 2 x 3 x ....... x 100 .
ai giúp zới
tim x : 1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)-1/1/2010
Tìm x biết:
a. 1/3 + 1/6 + 1/12 + ... + 2/x(x+1) = 2001/2003
b. |x + 1| + |x - 2| + |x + 7| = 5x - 10
c. |x2 - 2| + |2 - x2| = 14
Tìm x;y;
\(\frac{x^2+y^2}{1+x^2+y^2}=\frac{x^2}{1+x^2}+\frac{y^2}{1+y^2}\)
Tính A = ( 1- 1/1+2+3)x(1-1/1+2+3+4 )x....x(1/1+2+....+100)
bai 1: Tinh nhanh
a) 1/2 + 1/4 + 1/8 + 1/16 + 1/32
b) 1/2 x 1/2 + 1/2 x 1/3 + 1/3 + 1/3 + 1/4 + 1/4 x 1/5 + 1/5 x 1/6
B1:Tính nhanh:
a)M= -1/3 . 141/17 - 39/3 . -1/17
b)N= -9/16 . 13/3 - (-3/4)^2 . 19/3
c)P=(1+1/1.3) (1+1/2.4) (1+1/3.5)......(1+1/99.101)
B2:Tìm x,biết
a)1/2+3/2:x=1/4
b)3/4+1/4.x=7
c)1/2.4 + 1/4.6 +.........+1/(2x-2).2x = 11/48
B3:Tìm x,biết
a)(x-1/2)^2=1/81
b)x+x(1+1/x)+x(1+2/x)=1/3
c)2/x+4=3/x+5
Giải gấp hộ mk cái mấy bn ơi
Tìm x biết :
1/\(\dfrac{4}{3}\) + x = \(\dfrac{2}{15}\) 2/\(\dfrac{1}{3}+\dfrac{1}{2}:\) x = -0,25 3/(\(\dfrac{2x}{5}+2\) ):(-4) = -1\(\dfrac{1}{2}\) 4/ x.( x + 1) = 0 5/3\(\dfrac{1}{2}-\dfrac{1}{2}x\) = \(\dfrac{2}{3}\)
6/1\(\dfrac{1}{2}+x=\dfrac{3}{2}-7\) 7/\(2x-16=40+x\) 8/\(x:\dfrac{5}{3}+\dfrac{1}{3}=\dfrac{-2}{5}\) 9/\(\dfrac{x}{4}=\dfrac{9}{x}\)
thực hiện phép tính
a, (-3/4+ 5/6): (2/9 - 7/12)
Tìm x, biết:
a, 1,5+ 1/1/4 x= 2/3
b, (2,7 x - 1/1/2 x) : 2/7= -21/4
c, 5/8 +1/3: x = 1/2
d, -5/6+ 8/3 + -29/6 < x < -1/2+ 2+ 5/2 ( với x thuộc Z)
Tìm x biết:
a) 2x+3 - 2x+2 - 2x+1 = 64
b) (x - 1)2 = (x - 1)4