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

Toán Lớp 8: rút gọn 2x(5-3x)-2x(3x-5)-(3-4x) f)(3x+1)(9x^2-3x+1)-27x(x+2)(x-2) g)(x-4)(x^2+4x+16)-x(x-5)(5+x) h)(2+5x)(6x-8)+3x(2x-5)-(6x+5)^2 ai

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

Toán Lớp 8: rút gọn
2x(5-3x)-2x(3x-5)-(3-4x)
f)(3x+1)(9x^2-3x+1)-27x(x+2)(x-2)
g)(x-4)(x^2+4x+16)-x(x-5)(5+x)
h)(2+5x)(6x-8)+3x(2x-5)-(6x+5)^2
ai làm nhanh em cho trnh ạ

Comments ( 2 )

  1. ngoclanquynh
    ngoclanquynh
    12 Tháng Mười Một, 2022 at 9:06 sáng
    Reply
    2x(5-3x)-2x(3x-5)-(3-4x)
    = 10x-6x²-6x²+10x-3+4x
    = -12x²+24x-3
    f)(3x+1)(9x²-3x+1)-27x(x+2)(x-2)
    = 27x³+1-27x(x²-4)
    = 27x³+1-27x³+108x
    = 108x+1
    g)(x-4)(x²+4x+16)-x(x-5)(5+x)
    = x³-64-x(x²-25)
    = x³-64-x³+25x
    = 25x-64
    h)(2+5x)(6x-8)+3x(2x-5)-(6x+5)²
    = 12x-16+30x²-40x+6x²-15x-36x²-60x-25
    = -103x-41

  2. tonhu12
    tonhu12
    12 Tháng Mười Một, 2022 at 9:06 sáng
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
    i)  2x(5 – 3x) – 2x(3x – 5) – (3 – 4x)
    = 10x – 6x^2- 6x^2 + 10x – 3 + 4x
    = -12x^2 + 24x – 3
    f) (3x + 1)(9x^2- 3x + 1) – 27x(x + 2)(x – 2)
    = 27x^3 + 1 – 27x(x^2 – 4)
    = 27x^3 + 1 – 27x+108x
    = 108x+1
    g) (x – 4)(x^2 + 4x + 16) – x(x – 5)(5 + x)
    = x^3 – 64 – x(x^2 – 25)
    = x^3 – 64 – x^3 + 25x
    = 25x – 64
    h) (2 + 5x)(6x – 8) + 3x(2x – 5) – (6x + 5)^2
    = 12x – 16 + 30x^2 – 40x + 6x^2 – 15x – 36x^2 – 60x – 25
    = -103x – 41

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

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