Bài 2: Căn thức bậc hai và hằng đẳng thức căn bậc hai của bình phương
Các câu hỏi tương tự
tim cac so m,n,p thoa man : m+n+p+8=2canm-1 + 4cann-2 +6canp-3
tim cac so x,y,z thoa man :canx+cany-1 +canz-2 = 1/2(x+y+z)
tim cac so x,y,z thoa man :x+y+z+4=2canx-2 +4cany-3+6canz-5
Tim gtnn cua bieu thuc
C=5x^2-7x+4
D=x^2+y^2-2x-4y-6
Giúp mình nhé!!
2. Rut gon bieu thuc:
a) \(A=\sqrt{x-2+2\sqrt{x-3}}+\sqrt{x+6+6\sqrt{x-3}},voix>=3\)
3. Tim GTNN cua bieu thuc:
a) \(A=\sqrt{4x^2-12x+9}+\sqrt{x^2-10x+25}+\sqrt{9x^2-6x+1}+\sqrt{16x^2-72x+81}\)
b) \(B=\dfrac{1}{2}\sqrt{x^2}+\sqrt{x^2-2x+1}\)
Giup minh nhe!!
1. Rut gon bieu thuc:
a) Asqrt{11-6sqrt{2}}+3+sqrt{2}
b) Bsqrt{12+2sqrt{11}}+sqrt{12-2sqrt{11}}
2. Rut gon bieu thuc:
a) Asqrt{x-2+2sqrt{x-3}}+sqrt{x+6+6sqrt{x-3}},voix3
3. Tim GTNN cua bieu thuc:
a) Asqrt{4x^2-12x+9}+sqrt{x^2-10x+25}+sqrt{9x^2-6x+1}+sqrt{16x^2-72x+81}
b) Bdfrac{1}{2}sqrt{x^2}+sqrt{x^2-2x+1}
Đọc tiếp
Giup minh nhe!!
1. Rut gon bieu thuc:
a) \(A=\sqrt{11-6\sqrt{2}}+3+\sqrt{2}\)
b) \(B=\sqrt{12+2\sqrt{11}}+\sqrt{12-2\sqrt{11}}\)
2. Rut gon bieu thuc:
a) \(A=\sqrt{x-2+2\sqrt{x-3}}+\sqrt{x+6+6\sqrt{x-3}},voix>=3\)
3. Tim GTNN cua bieu thuc:
a) \(A=\sqrt{4x^2-12x+9}+\sqrt{x^2-10x+25}+\sqrt{9x^2-6x+1}+\sqrt{16x^2-72x+81}\)
b) \(B=\dfrac{1}{2}\sqrt{x^2}+\sqrt{x^2-2x+1}\)
1.voi gia tri nao cua x thi moi can thuc sau co nghia
a.sqrt{dfrac{x}{3}}
b.sqrt{-5x}
c.sqrt{4-x}
d.sqrt{3x+7}
2. tìm x de moi can thuc sau co nghia
a.sqrt{2x+7}
b.sqrt{-3x+4}
c.sqrt{dfrac{1}{-1+x}}
Đọc tiếp
1.voi gia tri nao cua x thi moi can thuc sau co nghia
a.\(\sqrt{\dfrac{x}{3}}\)
b.\(\sqrt{-5x}\)
c.\(\sqrt{4-x}\)
d.\(\sqrt{3x+7}\)
2. tìm x de moi can thuc sau co nghia
a.\(\sqrt{2x+7}\)
b.\(\sqrt{-3x+4}\)
c.\(\sqrt{\dfrac{1}{-1+x}}\)
1. Tim GTNN cua bieu thuc:
\(A=\dfrac{1}{2}\sqrt{x^2}+\sqrt{x^2-2x+1}\)
2. Rut gon bieu thuc:
a) \(A=\sqrt{29-4\sqrt{7}}+\sqrt{23+8\sqrt{7}}\)
b)\(B=\sqrt{x+2\sqrt{x-1}}+\sqrt{x-2\sqrt{x-1}},voix>=2\)
tim ginn cua bieu thuc P=\(\sqrt{\dfrac{x^2}{4}+\sqrt{ }x^2-4}+\sqrt{\dfrac{x^2}{4}-\sqrt{x^2-4}}\)
Giup minh nhe!!
1. Rut gon bieu thuc:
a) \(A=\sqrt{x-2+2\sqrt{x-3}}+\sqrt{x+6+6\sqrt{x-3}}voix>=3\)
Cho 3 số không âm thỏa mãn x+y+z=3. Tìm \(Mmin=\dfrac{x}{x^2+1}+\dfrac{y}{y^2+1}+\dfrac{z}{z^2+1}\)
gia tri nho nhat cua x de \(\dfrac{x^2-2x+2007}{2007x^2}\)
co gia tri nho nhat