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

Toán Lớp 8: a)x^3-3x^2+9x b)2x^2-4x+x-2 c)3x^2y+12x^2y d)5x^2-7x+2 e)6x^2-7x-3 f)2x^2-5x-3

Home/ Toán Lớp 8: a)x^3-3x^2+9x b)2x^2-4x+x-2 c)3x^2y+12x^2y d)5x^2-7x+2 e)6x^2-7x-3 f)2x^2-5x-3

Toán Lớp 8: a)x^3-3x^2+9x b)2x^2-4x+x-2 c)3x^2y+12x^2y d)5x^2-7x+2 e)6x^2-7x-3 f)2x^2-5x-3

Tháng Mười 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a)x^3-3x^2+9x
b)2x^2-4x+x-2
c)3x^2y+12x^2y
d)5x^2-7x+2
e)6x^2-7x-3
f)2x^2-5x-3

Comments ( 2 )

  1. dantam45
    dantam45
    28 Tháng Mười, 2022 at 9:44 chiều
    Reply
    $a) x^3-3x^2+9x=x(x^2-3x+9)$
    $b) 2x^2-4x+x-2$
    $=2x(x-2)+(x-2)$
    $=(2x+1)(x-2)$
    $c) 3x^2y+12x^2y$
     $=15x^2y$
    $d) 5x^2-7x+2$
    $=5x^2-5x-2x+2$
    $=5x(x-1)-2(x-1)$
    $=(5x-2)(x-1)$
    $e) 6x^2-7x-3$
    $=6x^2-9x+2x-3$
    $=3x(2x-3)+(2x-3)$
    $=(3x+1)(2x-3)$
    $f) 2x^2-5x-3$
    $=2x^2-6x+x-3$
    $=2x(x-3)+(x-3)$
    $=(2x+1)(x-3)$

  2. kymmailien
    kymmailien
    28 Tháng Mười, 2022 at 9:44 chiều
    Reply

    .
    toan-lop-8-a-3-3-2-9-b-2-2-4-2-c-3-2y-12-2y-d-5-2-7-2-e-6-2-7-3-f-2-2-5-3

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

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