b/ \(\dfrac{a}{b}=\dfrac{b}{c}=\dfrac{c}{d}\)

\(\Rightarrow\left(\dfrac{a}{b}\right)^3=\dfrac{a}{d}\left(1\right)\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có

\(\dfrac{a}{b}=\dfrac{b}{c}=\dfrac{c}{d}=\dfrac{a+b+c}{b+c+d}\)

=> \(\left(\dfrac{a}{b}\right)^3=\left(\dfrac{a+b+c}{c+d+b}\right)^3\) (2)Từ (1) và (2)=>đpcm

SORY I'M I GRADE 6

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mày hỏi vả bài kiểm tra à thằng điên 

1.

Ta có:

\(x^4+y^4\ge\dfrac{1}{2}\left(x^2+y^2\right)^2=\dfrac{1}{2}\left(x^2+y^2\right)\left(x^2+y^2\right)\ge\left(x^2+y^2\right)xy\)

Đặt vế trái của BĐT cần chứng minh là P, áp dụng bồ đề vừa chứng minh ta có:

\(P\le\dfrac{a.abc}{bc\left(b^2+c^2\right)+a.abc}+\dfrac{b.abc}{ca\left(c^2+a^2\right)+b.abc}+\dfrac{c.abc}{ab\left(a^2+b^2\right)+c.abc}\)

\(P\le\dfrac{a^2.bc}{bc\left(a^2+b^2+c^2\right)}+\dfrac{b^2.ac}{ca\left(a^2+b^2+c^2\right)}+\dfrac{c^2.ab}{ab\left(a^2+b^2+c^2\right)}=1\)

Dấu "=" xảy ra khi \(a=b=c=1\)

2.

\(\dfrac{x^2}{y+z}+\dfrac{y^2}{z+x}+\dfrac{z^2}{x+y}\ge\dfrac{\left(x+y+z\right)^2}{2\left(x+y+z\right)}=\dfrac{x+y+z}{2}=1\)

Dấu "=" xảy ra khi \(x=y=z=\dfrac{2}{3}\)

ngu như con lợn

Bài 2:

a) Áp dụng BĐT AM - GM ta có:

\(\dfrac{1}{4}\left(\dfrac{1}{a}+\dfrac{1}{b}\right)=\dfrac{1}{4a}+\dfrac{1}{4b}\) \(\ge2\sqrt{\dfrac{1}{4^2ab}}=\dfrac{2}{4\sqrt{ab}}=\dfrac{1}{2\sqrt{ab}}\)

\(\ge\dfrac{1}{a+b}\) (Đpcm)

b) Trừ 1 vào từng vế của BĐT ta được BĐT tương đương:

\(\left(\frac{x}{2x+y+z}-1\right)+\left(\frac{y}{x+2y+z}-1\right)+\left(\frac{z}{x+y+2z}-1\right)\le\frac{-9}{4}\)

\(\Leftrightarrow-\left(x+y+z\right)\left(\frac{1}{2x+y+z}+\frac{1}{x+2y+z}+\frac{1}{x+y+2z}\right)\le-\frac{9}{4}\)

\(\Leftrightarrow\left(x+y+z\right)\left(\frac{1}{2x+y+z}+\frac{1}{x+2y+z}+\frac{1}{x+y+2z}\right)\ge\frac{9}{4}\)

Áp dụng BĐT phụ \(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}\ge\dfrac{9}{a+b+c}\) ta có:

\(\dfrac{1}{2x+y+z}+\dfrac{1}{x+2y+z}+\dfrac{1}{x+y+2z}\)

\(\ge\dfrac{9}{2x+y+z+x+2y+z+x+y+2z}=\dfrac{9}{4\left(x+y+z\right)}\)

\(\Leftrightarrow\left(x+y+z\right)\left(\frac{1}{2x+y+z}+\frac{1}{x+2y+z}+\frac{1}{x+y+2z}\right)\ge\frac{9}{4}\)

\(\Leftrightarrow\dfrac{x}{2x+y+z}+\dfrac{y}{x+2y+z}+\dfrac{z}{x+y+2z}\le\dfrac{3}{4}\) (Đpcm)

Bài 1:

Áp dụng BĐT Cauchy-Schwarz dạng Engel ta có:

\(VT\ge\dfrac{\left(a+b\right)^2}{a-1+b-1}=\dfrac{\left(a+b\right)^2}{a+b-2}\)

Nên cần chứng minh \(\dfrac{\left(a+b\right)^2}{a+b-2}\ge8\)

\(\Leftrightarrow\left(a+b\right)^2\ge8\left(a+b-2\right)\)

\(\Leftrightarrow a^2+2ab+b^2\ge8a+8b-16\)

\(\Leftrightarrow\left(a+b-4\right)^2\ge0\) luôn đúng

Thay A,B,C vào vế trái , ta có :

\(VT=\left(1+\frac{x-y}{x+y}\right)\left(1+\frac{y-z}{y+z}\right)\left(1+\frac{z-x}{z+x}\right)\)

       \(=\left(\frac{x+y+x-y}{x+y}\right)\left(\frac{y+z+y-z}{y+z}\right)\left(\frac{z+x+z-x}{z+x}\right)\)

          \(=\frac{2x}{x+y}.\frac{2y}{y+z}.\frac{2z}{z+X}\) \(=\frac{8xyz}{\left(x+y\right)\left(y+z\right)\left(z+x\right)} \)         (1)

Thay A,B,C vào vế phải , ta có 

\(VP=\left(1-\frac{x-y}{x+y}\right)\left(1-\frac{y-z}{y+z}\right)\left(1-\frac{z-x}{z+x}\right)\)

         \(=\left(\frac{x+y-x+y}{x+y}\right)\left(\frac{y+z-y+z}{y+z}\right)\left(\frac{z+x-z+x}{z+x}\right)\)

       \(=\frac{2y}{x+y}.\frac{2z}{y+z}.\frac{2x}{z+x}=\frac{8xyz}{\left(x+y\right)\left(y+z\right)\left(z+x\right)}\)   (2)

Từ (1),(2) => đpcm

a) 2x=3y=4z⇒\(\dfrac{2}{\dfrac{1}{x}}=\dfrac{3}{\dfrac{1}{y}}=\dfrac{4}{\dfrac{1}{z}}=\dfrac{2+3+4}{\dfrac{1}{x}+\dfrac{1}{y}+\dfrac{1}{z}}=\dfrac{9}{3}=3\) ( Vì\(\dfrac{1}{x}+\dfrac{1}{y}+\dfrac{1}{z}=3\))

⇒ x=\(\dfrac{3}{2}\) ; y=1; z=\(\dfrac{3}{4}\)

b) \(\dfrac{bz-cy}{a}=\dfrac{cx-az}{b}=\dfrac{ay-by}{c}\)

= \(\dfrac{abz-acy}{a^{2^{ }}}=\dfrac{bcx-abz}{b^{2^{ }}}=\dfrac{acy-bcy}{c^2}\) =\(\dfrac{\left(abz-acy\right)+\left(bcx-abz\right)+\left(acy-bcy\right)}{a^2+b^2+c^{2^{ }}}=\dfrac{0}{a^2+b^2+c^{2^{ }}}=0\)

⇒\(\dfrac{bz-cy}{a}=\dfrac{cx-az}{b}=\dfrac{ay-by}{c}=0\)

⇒ ✽bz-cy=0⇒bz=cy⇒\(\dfrac{b}{y}=\dfrac{c}{z}\) (1)

✽ cx-az=0⇒cx=az⇒ \(\dfrac{a}{x}=\dfrac{c}{z}\) (2)

Từ (1) và (2) suy ra\(\dfrac{a}{x}=\dfrac{b}{y}=\dfrac{c}{z}\)

Có: 1+x = \(\frac{a+b+a-b}{a+b}\) = \(\frac{2a}{a+b}\)

Tương tự, 1 + y = \(\frac{2b}{b+c}\)

1 + z = \(\frac{2c}{c+a}\)

1 - x = \(\frac{q+b-a+b}{a+b}\) = \(\frac{2a}{a+b}\)

Tương tự như thế rồi nhân (1+x), (1+y), (1+z) với nhau; (1-z), (1-y), (1-z) với nhau