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

Toán Lớp 8: Bài 1 thực hiện phép tính a) ( 2x + 3 ) ( 4x – 5 ) b) ( x – 5 )^2 + x ( 3x +1 )

Toán Lớp 8: Bài 1 thực hiện phép tính
a) ( 2x + 3 ) ( 4x – 5 )
b) ( x – 5 )^2 + x ( 3x +1 )

Comments ( 1 )

  1. a) (2x + 3)( 4x -5 )
    = 8x^{2} – 10x + 12x – 15
    = 8x^{2} + 2x – 15
    b) (x – 5)^{2} + x(3x + 1)
    = x^{2} – 10x + 25 + 3x^{2} + 1
    = 4x^{2} – 10x + 26

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

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