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

Toán Lớp 8: Thực hiện phép nhân a) (5x²-3x³+4x-1) (-2x²+3) b) (2x³-3x-5) (x²-4) Giúp tui zới mọi ngừi :<

Toán Lớp 8: Thực hiện phép nhân
a) (5x²-3x³+4x-1) (-2x²+3)
b) (2x³-3x-5) (x²-4)
Giúp tui zới mọi ngừi :<

Comments ( 2 )

  1. a)(5x²-3x³+4x-1)(-2x²+3)
    =-10x⁴+15x²+6x⁵-9x³-8x³+12x+2x²-3
    =6x⁵-10x⁴-17x³+17x²+12x-3
    b)(2x³-3x-5)(x²-4)
    =2x⁵-12x³-3x³+12x-5x²+20
    =2x⁵-15x³-5x²+12x+20
    Chúc bạn hok tốt
    Cho mk xin ctlhn nha

  2. a) (5x^2-3x^3+4x-1)(-2x^2+3)
    =5x^2.(-2x^2)+5x^2.3-3x^3.(-2x^2)+(-3x^3).3+4x.(-2x^2)+4x.3+2x^2-3
    =-10x^4+15x^2+6x^5-9x^3-8x^3+12x+2x^2-3
    =6x^5-10x^4-17x^3+17x^2+12x-3
    b) (2x^3-3x-5)(x^2-4)
    =2x^3.x^2+2x^3.(-4)-3x.x^2-3x.(-4)-5.x^2-5.(-4)
    =2x^5-8x^3-3x^3+12x-5x^2+20
    =2x^5-11x^3-5x^2+12x+20
     

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