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

Toán Lớp 9: (3-2 √x) ×(2+3 √x)=16-6x tìm x

Toán Lớp 9: (3-2 √x) ×(2+3 √x)=16-6x
tìm x

Comments ( 1 )

  1. (3-2\sqrt{x})(2+3\sqrt{x})=16-6x
    <=> 2(3-2\sqrt{x})+3(3-2\sqrt{x})\sqrt{x}=16-6x
    <=>6-4\sqrt{x}+3(3-2\sqrt{x})\sqrt{x}+6x=16
    <=> 6-4\sqrt{x}+9\sqrt{x}-6x+6x=16
    <=> 6-5\sqrt{x}-6x+6x=16
    <=> 6+5\sqrt{x}=16
    <=> 5\sqrt{x}=10
    <=> \sqrt{x}=2
    <=> x=4
    Vậy x=4
     

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