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

Toán Lớp 8: a) x2 + 10x + 25 . e) x2 + 6xy + 9y2 . b) x2 + 14x + 49 . f) 16×2 + 24xy +9y2 . c) 4×2 + 4x + 1 . g) ( 2x +1)2 +12 (2x + 1) + 36 . d) 9

Tháng Sáu 16, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a) x2 + 10x + 25 . e) x2 + 6xy + 9y2 .
b) x2 + 14x + 49 . f) 16×2 + 24xy +9y2 .
c) 4×2 + 4x + 1 . g) ( 2x +1)2 +12 (2x + 1) + 36 .
d) 9×2 + 30x +25 . h) (x2 + 2x)2 + 2(x2 + 2x) + 1 .
nhanhhh nha, trên 5 câu không thì báo cáo

Comments ( 2 )

  1. maingoctruc
    maingoctruc
    16 Tháng Sáu, 2022 at 7:26 sáng
    Reply

    Giải đáp:a (x+5)²b (x+7)²c (2x+1)²d(3x+5)²e (x+3y)²

    xin hay nhất ạ
     

  2. thucquyenlan
    thucquyenlan
    16 Tháng Sáu, 2022 at 7:25 sáng
    Reply
    a) x^2+10x+25
    =x^2+2.x.5+5^2
    =(x+5)^2
    b) x^2+14x+49
    =x^2+2.x.7+7^2
    =(x+7)^2
    c) 4x^2+4x+1
    =(2x)^2+2.2x.1+1^2
    =(2x+1)^2
    d) 9x^2+30x+25
    =(3x)^2+2.3x.5+5^2
    =(3x+5)^2
    e) x^2-6xy+9y^2
    =x^2-2.x.3y+(3y)^2
    =(x-3y)^2
    f) 16x^2+24xy+9y^2
    =(4x)^2+2.4x.3y+(3y)^2
    =(4x+3y)^2
    g) (2x+1)^2+12(2x+1)+36
    =(2x+1)^2+2.(2x+1).6+6^2
    =(2x+1+6)^2
    =(2x+7)^2
    h) (x^2+2x)^2+2(x^2+2x)+1
    =(x^2+2x)^2+2.(x^2+2x).1+1^2
    =(x^2+2x+1)^2
     

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

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