Toán Lớp 7: x-10 căn x +25
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Toán Lớp 7: x-10 căn x +25
:((((((((((((((((((((((
Comments ( 2 )
#Rick
x – 10\sqrt{x}+25
=\sqrt{x}^2 – 10\sqrt{x} + 25
=\sqrt{x}^2 -2*\sqrt{x}*5+25
=\sqrt{x}^2 – 2*\sqrt{x}*5+5^2
=(\sqrt{x}-5)^2
x – 10\sqrt{x} + 25
= \sqrt{x}^2 – 10\sqrt{x} + 5^2
= \sqrt{x}^2 – 2. 5. \sqrt{x} + 5^2
= ( \sqrt{x} – 5 )^2