\(\left(\sqrt{3}-1\right)\cdot3+\dfrac{3\sqrt{3}}{2\sqrt{3}}=3\sqrt{3}-3+\dfrac{3}{2}=3\sqrt{3}-\dfrac{3}{2}\)

\(d,\Leftrightarrow\left(2x-2\right)^4=1\Leftrightarrow2x-2=1\Leftrightarrow x=\dfrac{3}{2}\\ e,\Leftrightarrow3^x\left(1+3+3^2\right)=1053\\ \Leftrightarrow3^x\cdot13=1053\\ \Leftrightarrow3^x=81=3^4\Leftrightarrow x=4\\ f,3^{x+4}\cdot5^y=45^x\\ \Leftrightarrow3^{x+4}\cdot5^y=3^{2x}\cdot5^x\\ \Leftrightarrow\left\{{}\begin{matrix}x+4=2x\\x=y\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x=4\\y=4\end{matrix}\right.\)

mik hok có thời gian đou nhanh lơn nha céc mom

mik ma noi cac em ??

Tổng độ dài 2 đáy là:

1 x 2 = 2 (m)

Diện tích hình thang đó là:

2 x 1,5 : 2 = 1,5 (m²)

Đáp số: 1,5 m².

Chúc bạn học tốt.

😁😁😁

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\(b,\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}=0\\ \Rightarrow\left(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}\right)^2=0\\ \Rightarrow\dfrac{1}{a^2}+\dfrac{1}{b^2}+\dfrac{1}{c^2}+2\left(\dfrac{1}{ab}+\dfrac{1}{bc}+\dfrac{1}{ca}\right)=0\\ \Rightarrow2\left(\dfrac{1}{ab}+\dfrac{1}{bc}+\dfrac{1}{ca}\right)=-\left(\dfrac{1}{a^2}+\dfrac{1}{b^2}+\dfrac{1}{c^2}\right)\)

Vì \(\dfrac{1}{a^2}+\dfrac{1}{b^2}+\dfrac{1}{c^2}\ge0\Rightarrow2\left(\dfrac{1}{ab}+\dfrac{1}{bc}+\dfrac{1}{ca}\right)\le0\)

Vậy \(\dfrac{1}{ab}+\dfrac{1}{bc}+\dfrac{1}{ca}\le0\)