a,TH1:x+2=0
x =0-2
x =-2
TH2:x^2-64=0
x^2 =0+64
x^2 =64
Mà : x^2 =8^2
Vay x=8
cau b ko bt
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Các câu hỏi tương tự
tim x biet (x-2015)2015=1
Tim x biet: 1/10+1/15+1/21+.........+2/x.(x+1) = 2010/2012
tim x biet x^2015=1^x
tim x biet (x-1)^2017=4*(x-1)^2015
Tim x biet x^2014 + x^2012 + x^2010 + ... + x^2 + 1=
Bai 1.Tim x, y biet :
2x(3y-2)+(3y-2) = -55
Bai 2 .a) So sanh : -22/45 va -51/103
b) So sanh A = 2009^2009 +1 / 2009^2010 va B = 2009^2010-2/2009^2011-2
Bai 3 :
a)Tim so tu nhien co 3 chu so , biet rang khi chia so do cho cac so 25, 28,35thi duoc cac so du lan luot la 5,8,15
b)Tim x: (x+1)+(x+2)+(x+3)+...+(x+100)=205550
tim x biet
x + 4/2009 + x + 3 / 2010 = x + 2/2011 + x + 1/2012
tim x biet /x-2015/=1
Tim x la so tu nhien, biet:
x - 4/2015 - 1/2015 = 10 - 2x