a) a²(a-b)-b²(a-c)-c²(b-a)

=a²(a-b)-b²(a-c)+c²(a-b)

=(a-b)(a²-c²)-b²(a-c)

=(a-b)(a-c)(a+c)-b²(a-c)

=(a-c)[(a-b)(a+c)-b²]

b)a(b-c)³+b(c-a)³+c(a-b)³

=a(b-c)³-b[(a-b)+(b-c)]+c(a-b)³

=a(b-c)³-b[(a-b)³+3(a-b)²(b-c)+3(a-b)(b-c)²+(b-c)³]+c(a-b)³

=a(b-c)³-b(a-b)³+3b(a-b)²(b-c)+3b(a-b)(b-c)²+b(b-c)³+c(a-b)³

=(b-c)³(a-b)-(a-b)³(b-c)-3b(a-b)(b-c)(a-b+b-c)

=(b-c)³(a-b)-(a-b)³(b-c)-3b(a-b)(b-c)(a-c)

=(a-b)(b-c)[(b-c)²-(a-b)²-3b(a-c)]

=(a-b)(b-c)[(b-c-a+b)(b-c+a-b)-3b(a-c)]

=(a-b)(b-c)[(2b-a-c)(a-c)-3b(a-c)]

=(a-b)(b-c)(a-c)(2b-a-c-3b)

=-(a-b)(b-c)(a-c)(a+b+c)

=(a-b)(b-c)(c-a)(a+b+c)

c)abc-(ab+ac+bc)+(a+b+c)-1

=abc-ab-ac-bc+a+b+c-1

=abc-bc-ab+b-ac+c+a-1

=bc(a-1)-b(a-1)-c(a-1)+a-1

=(a-1)(bc-b-c+1)

=(a-1)[b(c-1)-(c-1)]

=(a-1)(c-1)(b-1)

=(a-1)(b-1)(c-1)

Ta có : \(3=ab+bc+ac\ge3\sqrt[3]{\left(abc\right)^2}\Rightarrow1\ge abc\)

\(\frac{bc}{a^2\left(b+2c\right)}+\frac{ac}{b^2\left(c+2a\right)}+\frac{ab}{c^2\left(a+2b\right)}\)

\(=\frac{\left(bc\right)^2}{abc\left(ab+2ac\right)}+\frac{\left(ac\right)^2}{abc\left(bc+2ab\right)}+\frac{\left(ab\right)^2}{abc\left(ca+2cb\right)}\)

\(\ge\frac{\left(ab+bc+ac\right)^2}{abc\left(3ab+3ac+3bc\right)}\)\(=\frac{3^2}{9abc}\)\(\ge1\)\(\left(dpcm\right)\)

đây đau phải la lớp1

khong phai toan lop 1

dung day la toan lop 2

Xét ΔABC vuông tại A có

\(BC^2=AB^2+AC^2\)

hay AC=12(cm)

Xét ΔACB vuông tại A có AH là đường cao ứng với cạnh huyền BC

nên \(\left\{{}\begin{matrix}AC^2=CH\cdot BC\\AH\cdot BC=AB\cdot AC\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}CH=\dfrac{144}{13}\left(cm\right)\\AH=\dfrac{60}{13}\left(cm\right)\end{matrix}\right.\)

    Áp dụng định lí PTG vào tam giác ABC vuông tại A:

\(AC=\sqrt{BC^2-AB^2}=\sqrt{13^2-5^2}=12\left(cm\right)\)

     Áp dụng hệ thức lượng vào tam giác ABC vuông tại A có AH là đường cao ứng với cạnh huyền BC, ta có:

\(AB^2=BH\cdot BC\\ \Rightarrow BH=\dfrac{AB^2}{BC}=\dfrac{5^2}{13}\approx1,9\left(cm\right)\\ \Rightarrow CH=BC-BH=11,1\left(cm\right)\)

\(AH^2=BH\cdot HC=11,1\cdot1,9=21,09\left(cm\right)\)

\(\left(a-b\right)^2+\left(b-c\right)^2+\left(c-a\right)^2=4\left(a^2+b^2+c^2-ab-ac-bc\right)\\ \Leftrightarrow a^2-2ab+b^2+b^2-2bc-c^2+c^2-2ac+a^2\\ =4a^2+4b^2+4c^2-4ab-4ac-4bc\\ \Leftrightarrow0=2a^2+2b^2+2c^2-2ab-2ac-2bc\\ \Leftrightarrow\left(a^2-2ab+b^2\right)+\left(a^2-2ac+c^2\right)+\left(b^2-2bc+c^2\right)=0\\ \Leftrightarrow\left(a-b\right)^2+\left(a-c\right)^2+\left(b-c\right)^2=0\Leftrightarrow\left\{\begin{matrix}\left(a-b\right)^2=0\Leftrightarrow a-b=0\Leftrightarrow a=b\\\left(a-c\right)^2=0\Leftrightarrow a-c=0\Leftrightarrow a=c\\\left(b-c\right)^2=0\Leftrightarrow b-c=0\Leftrightarrow b=c\end{matrix}\right.\)

Vậy a=b=c

a) Ta có: \(\left(\dfrac{AB}{AC}\right)^2=\dfrac{AB^2}{AC^2}=\dfrac{BH.BC}{CH.BC}=\dfrac{BH}{HC}\)

b) Ta có: \(\left(\dfrac{CA}{AB}\right)^4=\left(\dfrac{CA^2}{AB^2}\right)^2=\left(\dfrac{CH.BC}{BH.BC}\right)^2=\dfrac{CH^2}{BH^2}=\dfrac{CE.CA}{BD.BA}\)

\(=\dfrac{CE}{BD}.\dfrac{CA}{BA}\Rightarrow\left(\dfrac{CA}{AB}\right)^3=\dfrac{CE}{BD}\)

c) Ta có: \(AH^4=\left(AH^2\right)^2=\left(BH.CH\right)^2=BH^2.CH^2\)

\(=BD.BA.CE.CA=BD.CE\left(AB.AC\right)=BD.CE.AH.BC\)

\(\Rightarrow BD.CE.BC=AH^3\)

d) Vì \(\angle HDA=\angle HEA=\angle DAE=90\Rightarrow ADHE\) là hình chữ nhật

\(\Rightarrow AH=DE\Rightarrow AH^2=DE^2=DH^2+HE^2\)

Ta có: \(3AH^2+BD^2+CE^2=2AH^2+\left(DH^2+BD\right)^2+\left(HE^2+CE^2\right)\)

\(=2.HB.HC+BH^2+CH^2=\left(BH+CH\right)^2=BC^2\)