Câu hỏi:

\(2+{{x}^{2}}y\);

\(\frac{(x+{{y}^{3}})}{3y}\);

\(-\frac{3}{4}{{x}^{3}}y+7x\);

\(-\frac{1}{5}~{{x}^{4}}{{y}^{5}}\)

\({{\left( 2x-1 \right)}^{2}}\);

\({{\left( 2x+1 \right)}^{2}}\);

\({{\left( 4x-1 \right)}^{2}}\);

\(\left( 2x-1 \right)\left( 2x+1 \right)\)

\(\left( x-y \right)\left( x-1 \right)\);

\(\left( x+1 \right)\left( x-y \right)\);

\(\left( x-y \right)\left( x+y \right)\);

\(x\left( x-y \right)\)

x ≠ 2;

\(x\ne 3\);

\(x\ne -2\);

\(x\ne -3\)

\(\frac{x}{2y}\);

\(\frac{2x}{4y}\);

\(\frac{{{x}^{2}}}{2xy}\);

\(\frac{xy}{2{{y}^{2}}}\)

8

4

2

\(\frac{7}{3}\)

\(100 dm^3\)

\(100 dm^2\)

\(300 dm^3\)

\(300 dm^2\)

\(\widehat{C}={{105}^{o}}\);

\(\widehat{C}={{75}^{o}}\);

\(\widehat{C}={{95}^{o}}\);

\(\widehat{C}={{115}^{o}}\)

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