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

Toán Lớp 8: (5x+1)*(5x-2)-10*(x-10)=25x*(x+2)

Home/ Toán Lớp 8: (5x+1)*(5x-2)-10*(x-10)=25x*(x+2)

Toán Lớp 8: (5x+1)*(5x-2)-10*(x-10)=25x*(x+2)

Tháng Mười Hai 12, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: (5x+1)*(5x-2)-10*(x-10)=25x*(x+2)

Comments ( 2 )

  1. tongtung
    tongtung
    12 Tháng Mười Hai, 2022 at 10:46 sáng
    Reply
    (5x+1)(5x-2) – 10(x-10) = 25x(x+2)
    <=> 25x^2 – 5x – 2 – 10x + 100 = 25x^2 +50x
    <=> 25x^2 -15x +98 – 25x^3 – 50x = 0
    <=> -65x = -98
    <=> x = 98/65
    XIN 5 SAO VS HAY NHẤT Ạ

  2. haiyemy
    haiyemy
    12 Tháng Mười Hai, 2022 at 10:46 sáng
    Reply
    (5x+1)(5x-2) – 10(x-10) = 25x(x+2)
    <=> 25x^2 – 5x – 2 – (10x – 100) = 25x^2 + 50x
    <=> 25x^2 – 5x – 2 – 10 x + 100 – 25x^2 – 50x = 0
    <=> (25x^2 – 25x^2) – (5x + 10x + 50x) +(-2 + 100) = 0
    <=> -65x + 98 = 0
    <=> -65x = -98
    <=> x = 98/65
    Vậy x=98/65

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

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