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

Toán Lớp 8: Làm tính nhân : a)5x^2(3x^2-7x+2) b)(x+1)(y+2)

Toán Lớp 8: Làm tính nhân :
a)5x^2(3x^2-7x+2)
b)(x+1)(y+2)

Comments ( 2 )

  1. a)5x^2(3x^2-7x+2)
    =5x^2 . 3x^2 – 5x^2 . 7x + 5x^2 .2
    =15x^4 – 35x^3 + 10x^2
    b)(x+1).(y+2)
    =x.y+2.x+1.y+1.2
    =xy+2x+y+2

  2.  a)5x^2(3x^2-7x+2)
    =5x^2.3x^2-5x^2.7x+5x^2.2
    =15x^4-35x^3+10x^2
    b)(x+1)(y+2)
    =x.y+x.2+1.y+1.2
    =xy+2x+y+2

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

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