Toán Lớp 9: Rút gọn đê: 4$\sqrt{9}$ + 6 – 7$\sqrt{45}$
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Toán Lớp 9: Rút gọn đê: 4$\sqrt{9}$ + 6 – 7$\sqrt{45}$
Comments ( 2 )
=√(5-2.√5.2+4) – √(5+2√5.2+4)
=√(√5-2)^2 – √(√5+2)^2
=√5-2-√5-2
= -4