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

Toán Lớp 8: Phân tíchcácđa thức sauthành nhân tử:a/ 6x –8y b/ x2–14 x + 49 c/ 5×2–5xy –x + y d/64 –4×2–8xy –4y2

Tháng Sáu 1, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Phân tíchcácđa thức sauthành nhân tử:a/ 6x –8y
b/ x2–14 x + 49
c/ 5×2–5xy –x + y
d/64 –4×2–8xy –4y2

Comments ( 2 )

  1. ngocbichchau
    ngocbichchau
    1 Tháng Sáu, 2022 at 6:20 sáng
    Reply
    a,6x-8y=2(3x-4y)
    b,x^2-14x+49=(x-7)^2
    c, 5x^2-5xy-x+y=5x(x-y)-(x-y)=(x-y)(5x-1)
    d, 64-4x^2-8xy-4y^2=-4(x^2+2xy+y^2-16)=-4[(x+y)^2-4^2]=-4[(x+y-4)(x+y+4)
     
     

  2. hatuanlan
    hatuanlan
    1 Tháng Sáu, 2022 at 6:20 sáng
    Reply
    a) 6x-8y
    =2.3x-4.2y
    =2(3x-4y)
    b) x^2-14x+49
    =x^2-2x.7+7^2
    =(x-7)^2
    c) 5x^2-5xy-x+y
    =5x(x-y)+(y-x)
    =5x(x-y)-(x-y)
    =(x-y)(5x-1)
    d) 64-4x^2-8xy-4y^2
    =4(16-x^2 -2xy-y^2)
    =-4(x^2-16+2xy+y^2)
    =-4(x+y+4)(x+y-4)
     

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

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