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

Toán Lớp 9: a) 11+6√2=(3+ √2) ² b) 8-2 √7=(√7+1) ² c) (5- √3) ²=28-10√3

Toán Lớp 9: a) 11+6√2=(3+ √2) ²
b) 8-2 √7=(√7+1) ²
c) (5- √3) ²=28-10√3

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (3+\sqrt{2})²=9+3.2.\sqrt{2}+(\sqrt{2})²=11+6\sqrt{2}
    b) 8-2\sqrt{7}=(\sqrt{7})²- 2\sqrt{7}+1=(\sqrt{7}-1)²
    c) (5-\sqrt{3})²=5²-2.5.\sqrt{3}+(\sqrt{3})²
    =28-10\sqrt{3}

  2. a)VT=11+6sqrt2
    =3^2+2*3*sqrt2+(sqrt2)^2
    =(3+sqrt2)^2=VP
    b)VT=8-2sqrt7
    =(sqrt7)^2-2*sqrt7*1+1^2
    =(sqrt7-1)^2
    xem lại câu b
    c)VT=(5-sqrt3)^2
    =25-10sqrt3+3
    =28-10sqrt3=VP

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