Toán Lớp 9: Phân tích thành tích:
a) a-b²-10 b) x√x -y√y c) 2√2 +x√x
Hứa vote 5 sao+CTLHN
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Toán Lớp 9: Phân tích thành tích:
a) a-b²-10 b) x√x -y√y c) 2√2 +x√x
Hứa vote 5 sao+CTLHN
Comments ( 1 )
b)x\sqrt x – y\sqrt y \\
= {\left( {\sqrt x } \right)^3} – {\left( {\sqrt y } \right)^3}\\
= \left( {\sqrt x – \sqrt y } \right)\left( {x + \sqrt {xy} + y} \right)\\
c)2\sqrt 2 + x\sqrt x \\
= {\left( {\sqrt 2 } \right)^3} + {\left( {\sqrt x } \right)^3}\\
= \left( {\sqrt 2 + \sqrt x } \right)\left( {2 + \sqrt {2x} + x} \right)
\end{array}$