Đề thi online - Luyện tập Hằng đẳng thức - Có lời...

A \( a) 27\)

\( b) 4{x^2} + 8\)

\( c) \dfrac{4}{9}{y^2}\)

B \( a) -27\)

\( b) 4{x^2} + 5\)

\( c) \dfrac{4}{9}{y^2}\)

C \( a) 81\)

\( b) 4{x^2} + 5\)

\( c) -\dfrac{2}{3}{y^2}\)

D \( a) -27\)

\( b) 4{x^2} + 5\)

\( c) \dfrac{2}{3}{y^2}\)

A \({\left( {a + b + c} \right)^2}= {\left( {a + b} \right)^2} + {\left( {b + c} \right)^2} + {\left( {a + c} \right)^2}\)

B \({\left( {a + b + c} \right)^2} + {a^2} + {b^2} + {c^2}= {\left( {a + b} \right)^2} + {\left( {b + c} \right)^2} + {\left( {a + c} \right)^2}\)

C \({\left( {a + b + c} \right)^2}= {\left( {a + b} \right)^2} + {\left( {b + c} \right)^2} + {\left( {a + c} \right)^2} + {a^2} + {b^2} + {c^2}\)

D \({\left( {a + b + c} \right)^2} + {a^2} + {b^2} + {c^2}= 2{\left( {a + b} \right)^2} + 2{\left( {b + c} \right)^2} + 2{\left( {a + c} \right)^2}\)

A \( a) 100 \)

\( b) 1 \)

B \( a) 100 \)

\( b) 5 \)

C \( a) 10000 \)

\( b) 1 \)

D \( a) 10000 \)

\( b) 5 \)

A \( a) \max A=5 \)

\( b) \max B=4 \)

\( c) \min C=\dfrac{3}{2}\)

B \( a) \max A=1 \)

\( b) \max B=2 \)

\( c) \min C=\dfrac{3}{2}\)

C \( a) \min A=5 \)

\( b) \max B=4 \)

\( c) \max C=\dfrac{3}{2}\)

D \( a) \max A=5 \)

\( b) \max B=0 \)

\( c) \min C=-\dfrac{1}{2}\)