2
21mits
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1. cho a+b+c =1 va a^2+b^2+c^2=1.
tinh: a^4+b^4+c^4
2.cho a la so gom 2n so 1, b la so gom n+1 chu so 1 va c la so gom n chu so 6.
c/m: a+b+c+8 la so chinh phuong
3.a) tim GTNN cua A= 2x^2 + 9x^2 - 6xy - 6x - 12y + 2024
b)Tim GTLN cua B= -x^2 + 2xy - 4y^2 + 2x + 10y - 8
c)co hay khong cac so x,y,z thoa man:
x^2 + 4y^2 + z^2 - 4x +4y - 8z +23 +0
CAC BAN CO GANG GIUP MINH NGHEN
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tinh: a^4+b^4+c^4
2.cho a la so gom 2n so 1, b la so gom n+1 chu so 1 va c la so gom n chu so 6.
c/m: a+b+c+8 la so chinh phuong
3.a) tim GTNN cua A= 2x^2 + 9x^2 - 6xy - 6x - 12y + 2024
b)Tim GTLN cua B= -x^2 + 2xy - 4y^2 + 2x + 10y - 8
c)co hay khong cac so x,y,z thoa man:
x^2 + 4y^2 + z^2 - 4x +4y - 8z +23 +0
CAC BAN CO GANG GIUP MINH NGHEN