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

Toán Lớp 8: help me pleaseeeeeeeeeeee !!! 3(x^2-7)-x(3x+5) (12x^2y^2-6xy^2) : 3xy+2y 4/x+1+ 8/(x-1)(x+1)

Tháng Tư 25, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: help me pleaseeeeeeeeeeee !!!
3(x^2-7)-x(3x+5)
(12x^2y^2-6xy^2) : 3xy+2y
4/x+1+ 8/(x-1)(x+1)

Comments ( 1 )

  1. behocgioitoan
    behocgioitoan
    25 Tháng Tư, 2022 at 7:26 sáng
    Reply
    (1) 3(x^2-7)-x(3x+5)
    =3x^2-21-3x^2-5x
    =-21-5x
    (2) (12x^2y^2-6xy^2):3xy+2y
    =(12x^2y^2-6xy^2)/(3xy+2y)
    =(6xy^2(2x-1))/(3xy+2y)
    =(6xy^2(2x-1))/(y(3x+2))
    =(6xy(2x-1))/(3x+2)
    (3) (4)/(x+1)+(8)/((x-1)(x+1))
    =(4(x-1)+8)/((x-1)(x+1))
    =(4(x-1+2))/((x-1)(x+1))
    =(4(x+1))/((x-1)(x+1))
    =(4)/(x-1)

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

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