\(y\ge xy+1\ge2\sqrt{xy}\Rightarrow\sqrt{\dfrac{y}{x}}\ge2\Rightarrow\dfrac{y}{x}\ge4\)

\(Q=\dfrac{1-\dfrac{2y}{x}+2\left(\dfrac{y}{x}\right)^2}{\dfrac{y}{x}+\left(\dfrac{y}{x}\right)^2}\)

Đặt \(\dfrac{y}{x}=a\ge4\)

\(Q=\dfrac{2a^2-2a+1}{a^2+a}=\dfrac{2a^2-2a+1}{a^2+a}-\dfrac{5}{4}+\dfrac{5}{4}=\dfrac{\left(a-4\right)\left(3a-1\right)}{4\left(a^2+1\right)}+\dfrac{5}{4}\ge\dfrac{5}{4}\)

\(Q_{min}=\dfrac{5}{4}\) khi \(a=4\) hay \(\left(x;y\right)=\left(\dfrac{1}{2};2\right)\)

Ai giúp mik vs

Huhu ai giúp vs

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)

a: \(49-y^2=6\left(x-2021\right)^2\)

=>\(49-y^2\ge0\) và \(49-y^2\) ⋮6

=>\(y^2\in\left\lbrace1;16;25;49\right\rbrace\)

TH1: \(y^2=1\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-1=48\)

=>\(\left(x-2021\right)^2=8\)

mà x nguyên

nên x∈∅

TH2: \(y^2=16\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-16=33\)

=>\(\left(x-2021\right)^2=5,5\)

mà x nguyên

nên x∈∅

TH3: \(y^2=25\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-25=24\)

=>\(\left(x-2021\right)^2=4\)

=>x-2021=2 hoặc x-2021=-2

=>x=2023(nhận) hoặc x=2019(nhận)

\(y^2=25\)

=>y=5(nhận) hoặc y=-5(nhận)

TH4: \(y^2=49\)

Ta có: \(49-y^2=6\left(x-2021\right)^2\)

=>\(6\left(x-2021\right)^2=49-49=0\)

=>\(\left(x-2021\right)^2=0\)

=>x-2021=0

=>x=2021(nhận)

\(y^2=49\)

=>y=7(nhận) hoặc y=-7(nhận)