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

Toán Lớp 8: tính: a)(x – 2y)^2 b)(2x^2 + 3)^2 c)(x – 2)(x^2 + 2x + 4) d)(2x – 1)^3

Tháng Bảy 9, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: tính:
a)(x – 2y)^2
b)(2x^2 + 3)^2
c)(x – 2)(x^2 + 2x + 4)
d)(2x – 1)^3

Comments ( 1 )

  1. trucoanh55
    trucoanh55
    9 Tháng Bảy, 2022 at 10:39 sáng
    Reply
    a,
    (x-2y)^2
    =x^2-2.x.2y+(2y)^2
    =x^2-4xy+4y^2
    b,
    (2x^2+3)^2
    =(2x^2)^2+2.2x^2.3+3^2
    =4x^4+12x^2+9
    c,
    (x-2)(x^2+2x+4)
    =x^3-2^3
    =x^3-8
    d,
    (2x-1)^3
    =(2x)^3-3.(2x)^2.1+3.2x.1^2-1^3
    =8x^2-12x^2+6x-1

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

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