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

Toán Lớp 8: Tìm x, biết (3x-5)(5-3x)+9(x+1)²=30

Toán Lớp 8: Tìm x, biết
(3x-5)(5-3x)+9(x+1)²=30

Comments ( 2 )

  1. (3x-5)(5-3x)+9(x+1)^2=30
    3x(5-3x)-5(5-3x)+(3x+3)^2=30
    15x-9x^2-25+15x+9x^2+18x+9=30
    48x-16=30
    48x=46
    x=46/48
    x=23/24
    Cho mk xin hay nhất please
    Thank you

  2. text{Giải đáp:}
     23/24
    text{Lời giải và giải thích chi tiết:}
    (3x-5).(5-3x)+9(x+1)²=30
    => $15x-9x²-25+15x+9(x²+2x+1)-30=0$
    => $15x-9x²-25+15x+9x²+18x+9-30=0$
    => $48x-46=0$
    => $48x=46$
    => x=23/24

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