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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Rút gọn a) A= (√3 – 1) (√3 + 1) – ( 2 – √3)² b) B= (√5 – 1)² – (√5 – 2)²

Toán Lớp 9: Rút gọn
a) A= (√3 – 1) (√3 + 1) – ( 2 – √3)²
b) B= (√5 – 1)² – (√5 – 2)²

Comments ( 2 )

  1. a) A=(\sqrt{3}-1)(\sqrt{3}+1)-(2-\sqrt{3})^2
    A=3-1-(4+3-4\sqrt{3})
    A=2-7+4\sqrt{3}
    A=-5+4\sqrt{3}
    b) B=(\sqrt{5}-1)^2-(\sqrt{5}-2)^2
    B=(\sqrt{5}-1-\sqrt{5}+2)(\sqrt{5}-1+\sqrt{5}-2)
    B=2\sqrt{5}-3

  2. text{Giải đáp:}
    a) A = (\sqrt{3}-1)(\sqrt{3}+1)-(2-\sqrt{3})^2
    A = 3-1-(4-4\sqrt{3}+3)
    A = 2-4+4\sqrt{3}-3
    A = 4\sqrt{3}-5
    b) B = (\sqrt{5}-1)^2-(\sqrt{5}-2)^2
    B = (\sqrt{5}-1-\sqrt{5}+2)(\sqrt{5}-1+\sqrt{5}-2)
    B = 2\sqrt{5}-3
    text{~ Học Tốt Nha ~}
     

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222-9+11+12:2*14+14 = ? ( )