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

Toán Lớp 8: 27x^2(y-1)-9x^3(1-y) 7x^2+50x+7 ptđttnt

Tháng Sáu 14, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 27x^2(y-1)-9x^3(1-y)
7x^2+50x+7
ptđttnt

Comments ( 2 )

  1. quynhthanhnghi
    quynhthanhnghi
    14 Tháng Sáu, 2022 at 12:45 chiều
    Reply
    27x^2(y-1)-9x^3(1-y)
    =27x^2(y-1)+9x^3(y-1)
    =(y-1)(27x^2+9x^3)
    =9x^2(y-1)(3+x)
    7x^2+50x+7
    =7x^2+49x+x+7
    =(7x^2+49x)+(x+7)
    =7x(x+7)+(x+7)
    =(x+7)(7x+1)

  2. danvanthu
    danvanthu
    14 Tháng Sáu, 2022 at 12:45 chiều
    Reply
       27x^2( y – 1) – 9x^3 ( 1 – y )
    = 27x^2( y – 1) + 9x^3 ( y – 1 )
    = ( 27x^2 + 9x^3 )( y – 1 )
    =  9x^2( 3 + x )( y – 1 )
       7x^2 + 50x + 7
    = 7x^2 + x + 49x + 7
    = x( 7x + 1 ) + 7( 7x + 1 )
    = ( x + 7 )( 7x + 1 )
     

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

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