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

Toán Lớp 8: Quy đồng mẫu các phân thức sau: a) 6/(????^2+4????) ????à 3/(2????+8); b)(????+1)/(2????−2) ????à (−2????)/(????^2−1);

Toán Lớp 8: Quy đồng mẫu các phân thức sau:
a) 6/(????^2+4????) ????à 3/(2????+8);
b)(????+1)/(2????−2) ????à (−2????)/(????^2−1);

Comments ( 2 )

  1. a) 6/(????²+4????) ????à 3/(2????+8)
        6/(????²+4????)= (6.2)/[2.x(x+4)] = 12/2x(x+4)
        3/(2????+8) = 3.x/x.2(x+4) = 3x/2x(x+4)
    b)(????+1)/(2????−2) ????à (−2????)/(????²−1)
    (????+1)/(2????−2) = (x+1)/2(x-1) = (x+1)²/2(x-1)(x+1)
    (−2????)/(????²−1) = -2x/(x-1)(x+1) = -4x/2(x-1)(x+1)

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-quy-dong-mau-cac-phan-thuc-sau-a-6-2-4-a-3-2-8-b-1-2-2-a-2-2-1

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

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