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

Toán Lớp 7: A,(3x+5)^2=9 B,(5x-25)^123=0 Giải hộ mik với ạ

Toán Lớp 7: A,(3x+5)^2=9
B,(5x-25)^123=0
Giải hộ mik với ạ

Comments ( 2 )

  1. (3x+5)^2=9
    (3x+5)^2=(+-3)^2
    +)3x+5=3
    3x=3-5
    3x=-2
    x=-2:3
    x=-2/3
    +)3x+5=-3
    3x=-3-5
    3x=-8
    x=-8:3
    x=-8/3
    Vậy x in{-8/3;-2/3}
    —–
    (5x-25)^123=0
    (5x-25)^123=0^123
    =>5x-25=0
    5x=0+25
    5x=25
    x=25:5
    x=5
    Vậy x=5

  2. a)
    (3x+5)^2 = 9
    => (3x+5)^2 = (+-3)^2
    =>3x+5=3 hoặc 3x+5=-3
    +)3x+5=3
    => 3x=-2
    =>x=-2/3
    +)3x+5=-3
    =>3x=-8
    =>x=-8/3
    Vậy x\in{-2/3;-8/3}
    b)
    (5x-25)^123 = 0
    => (5x-25)^123 = 0^123
    => 5x – 25 = 0
    => 5x=25
    =>x=5
    Vậy x=5
     

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