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

Toán Lớp 8: a: 15x²y-5xy² b:2x²-2xy-5x+5y c:2xy-x²y²+16 d:x²-x-6

Home/ Toán Lớp 8: a: 15x²y-5xy² b:2x²-2xy-5x+5y c:2xy-x²y²+16 d:x²-x-6

Toán Lớp 8: a: 15x²y-5xy² b:2x²-2xy-5x+5y c:2xy-x²y²+16 d:x²-x-6

Tháng Sáu 19, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a: 15x²y-5xy²
b:2x²-2xy-5x+5y
c:2xy-x²y²+16
d:x²-x-6

Comments ( 2 )

  1. ngoclanquynh
    ngoclanquynh
    19 Tháng Sáu, 2022 at 9:01 chiều
    Reply
    a/ 15x^2y-5xy^2
    = 5xy(3x-y)
    b/ 2x^2-2xy-5x+5y
    = 2x(x-y)-5(x-y)
    = (2x-5)(x-y)
    c/ 2xy-x^2-y^2+16
    = -(x-y)^2+16
    = -[(x-y)^2-16]
    = -(x-y-4)(x-y+4)
    d/ x^2-x-6
    = x^2+2x-3x-6
    = x(x+2)-3(x+2)
    = (x-3)(x+2)

  2. tonhu12
    tonhu12
    19 Tháng Sáu, 2022 at 9:00 chiều
    Reply
    $\\$
    Giải đáp + giải thích các bước giải :
    $a,\\15x^2y – 5xy^2\\=5xy (3x – y)\\b,\\2x^2-2xy -5x+5y\\=(2x^2-2xy)-(5x-5y)\\=2x (x-y) – 5(x-y)\\=(x-y)(2x-5)\\c,\\2xy-x^2-y^2+16\\=- (x^2 – 2xy + y^2-16)\\=-[(x-y)^2 – 4^2]\\=-(x-y-4)(x-y+4)\\d,\\x^2-x-6\\=x^2-3x+2x-6\\=(x^2-3x)+(2x-6)\\=x(x-3)+2(x-3)\\=(x-3)(x+2)$

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

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