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mình làm phần Iv Writing thui nhá!
1.Do you like play table tennis
2.My friend goes to drama club every tuesday
3.My sister doesnt clean her room everyday
1: A=-1/2*xy^3*4x^2y^2=-2x^3y^5
Bậc là 8
Phần biến là x^3;y^5
Hệ số là -2
2:
a: P(x)=3x+4x^4-2x^3+4x^2-x^4-6
=3x^4-2x^3+4x^2+3x-6
Q(x)=2x^4+4x^2-2x^3+x^4+3
=3x^4-2x^3+4x^2+3
b: A(x)=P(x)-Q(x)
=3x^4-2x^3+4x^2+3x-6-3x^4+2x^3-4x^2-3
=3x-9
A(x)=0
=>3x-9=0
=>x=3
Bài 4:
\(a,\sqrt{64.\left(x-1\right)^2}=16\\ \Leftrightarrow8\sqrt{\left(x-1\right)^2}=16\\ \\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{16}{8}=2\\ \left|x-1\right|=2\\ \Leftrightarrow\left[{}\begin{matrix}x-1=2\\x-1=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\\ b,\sqrt{4\left(x-2\right)}=8\\ \Leftrightarrow2\sqrt{x-2}=8\\ \Leftrightarrow\sqrt{x-2}=\dfrac{8}{2}=4\\ \Leftrightarrow x-2=4^2=16\\ \Leftrightarrow x=16+2=18\\ c,\dfrac{\sqrt{2x}}{\sqrt{8}}=5\\ \Leftrightarrow\dfrac{\sqrt{2}\sqrt{x}}{2\sqrt{2}}=5\\ \Leftrightarrow\dfrac{\sqrt{x}}{2}=5\\ \Leftrightarrow\sqrt{x}=5.2=10\\ \Leftrightarrow x=10^2=100\)
Bài 2:
\(a,\left(\sqrt{75}-2\sqrt{12}-\sqrt{27}\right).\sqrt{3}\\ =\left(\sqrt{3.5^2}-2.\sqrt{3.2^2}-\sqrt{3.3^2}\right).\sqrt{3}\\ =\left(5\sqrt{3}-2.2\sqrt{3}-3\sqrt{3}\right).\sqrt{3}\\ =-2\sqrt{3}.\sqrt{3}=-2.3=-6\\ b,\left(5\sqrt{2}-\sqrt{8}-\sqrt{98}\right):\sqrt{2}\\ =\left(5\sqrt{2}-\sqrt{2^2.2}-\sqrt{2.7^2}\right):\sqrt{2}\\ =\left(5\sqrt{2}-2\sqrt{2}-7\sqrt{2}\right):\sqrt{2}\\ =-4\sqrt{2}:\sqrt{2}=-4\)
\(c,\\ \dfrac{\sqrt{18}}{\sqrt{2}}=\sqrt{\dfrac{18}{2}}=\sqrt{9}=\sqrt{3^2}=3\\ d,\\ \sqrt{\dfrac{45}{7}}.\sqrt{\dfrac{28}{5}}=\sqrt{\dfrac{45.28}{7.5}}=\sqrt{\dfrac{9.5.4.7}{7.5}}=\sqrt{9.4}=\sqrt{36}=\sqrt{6^2}=6\)