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

Toán Lớp 8: 3)14x^2y-21xy^2+28x^2y^2 4)2/5x(y-1)-2/5y.(y-1) 5)10x(x-y)-8y(y-x)

Tháng Mười Hai 5, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 3)14x^2y-21xy^2+28x^2y^2
4)2/5x(y-1)-2/5y.(y-1)
5)10x(x-y)-8y(y-x)

Comments ( 1 )

  1. ngochuong2k2
    ngochuong2k2
    5 Tháng Mười Hai, 2022 at 8:17 chiều
    Reply
    14x^2y-21xy^2+28x^2y^2
    =7xy(2x-3y+4xy)
    —-
    2/5x(y-1)-2/5y(y-1)
    =(y-1)(2/5x-2/5y)
    =(y-1)2/5(x-y)
    =2/5(y-1)(x-y)
    —-
    10x(x-y)-8y(y-x)
    =10x(x-y)+8y(x-y)
    =(x-y)(10x+8y)
    =(x-y)2(5x+4y)
    =2(x-y)(5x+4y)
     

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

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