Lớp 6 mới có học mà bạn: https://lop6.net/giao-an-so-hoc-lop-6-bai-6-cong-tru-da-thuc-1104/

\(4\left(x+3\right)+2\left(x-1\right)=16\)

\(4x+12+2x-2=16\)

\(6x=6\)

\(x=1\)

\(x^2+6x-7=0\)

\(\Leftrightarrow\left(x-1\right)\left(x+7\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-7\end{matrix}\right.\)

Vậy \(S=\left\{1;-7\right\}\)

\(x^2-15x=0\)

\(\Leftrightarrow x\left(x-15\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=15\end{matrix}\right.\)

Vậy \(S=\left\{0;15\right\}\)

12 tạ = \(\dfrac{3}{25}\) tấn

\(4-\dfrac{2\sqrt{3}}{2\sqrt{3}}=4-1=3\)

e) \(\dfrac{67}{77}=\dfrac{5561}{6391};\dfrac{73}{83}=\dfrac{5621}{6391}\)

vì 5561 < 5621 nên \(\dfrac{67}{77}< \dfrac{73}{83}\)

f) \(\dfrac{11}{32}=\dfrac{539}{1568};\dfrac{16}{49}=\dfrac{512}{1568}\)

vì 539 > 512 nên \(\dfrac{11}{32}>\dfrac{16}{49}\)

- do housework

-  dishwashing

- cook meals

- dust the room

- babysitting

Tên trong sự kiện: H. Dayy

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