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

Toán Lớp 8: Bài 2: Thực hiện phép tính a) 3x2y ( 2x –y ) b) x(x – 3) – (x + 2)(x – 2) +3x b) (3x – 5)(2x + 11)

Toán Lớp 8: Bài 2: Thực hiện phép tính
a) 3x2y ( 2x –y )
b) x(x – 3) – (x + 2)(x – 2) +3x
b) (3x – 5)(2x + 11)

Comments ( 2 )

  1. a) 3x^2y ( 2x –y )
    =6x^3y-3x^2y^2
    b) x(x – 3) – (x + 2)(x – 2) +3x
    =x^2-3x-x^2+4+3x
    =4
    c) (3x – 5)(2x + 11)
    =6x^2+33x-10x-55
    =6x^2+23x-55
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    a) 3x²y ( 2x –y )
    = 6x³y – 3x²y²
    b) x(x – 3) – (x + 2)(x – 2) +3x
    = x² – 3x – (x² – 2x + 2x – 4) + 3x
    = x² – 3x – x² + 2x – 2x + 4 + 3x
    = 4
    b) (3x – 5)(2x + 11)
    = 6x² + 33x – 10x – 55
    = 6x² + 23x -55

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

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