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

Toán Lớp 7: Tìm x a.x mũ 2=16 b.x mũ 3=-8 c.(2x-3) mũ 2=25 mn lm nhanh đầy đủ jup mk

Toán Lớp 7: Tìm x
a.x mũ 2=16
b.x mũ 3=-8
c.(2x-3) mũ 2=25
mn lm nhanh đầy đủ jup mk

Comments ( 2 )

  1. #tnvt
    a)x^2=16
    =>x^2=(+-4)^2
    =>x=+-4
    Vậy x\in{+-4}
    b)x^3=-8
    =>x^3=(-2)^3
    =>x=-2
     Vậy x=-2
    c)(2x-3)^2=25
    =>(2x-3)^2=(+-5)^2
    =>[(2x-3=-5),(2x-3=5):}
    =>[(x=-1),(x=4):}
    Vậy x\in{1;4}

  2. a)
    x^2 = 16
    => x^2 = (+-4)^2
    => x \in {4;-4}
    Vậy x \in {4;-4}
    b)
    x^3 = -8
    => x^3 = (-2)^3
    =>x=-2
    Vậy x=-2
    c)
    (2x-3)^2 = 25
    => (2x-3)^2 = (+-5)^2
    =>2x-3=5 hoặc 2x-3=-5
    +)2x-3=5=>2x=8=>x=4
    +)2x-3=-5=>2x=-2=>x=-1
    Vậy x \in {4;-1}
     

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