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

Toán Lớp 8: Thực hiện phép tính a 3×2•(2x2_5x-4) b (x+1)2+(x-2)•(x+3)-4x

Toán Lớp 8: Thực hiện phép tính
a 3×2•(2x2_5x-4)
b (x+1)2+(x-2)•(x+3)-4x

Comments ( 2 )

  1. a)3x^2.(2x^2-5x-4)
    =6x^4-15x^3-12x^2
    b)(x+1)^2+(x-2).(x+3)-4x
    =(x^2+2x+1)+(x^2+3x-2x-6)-4x
    =x^2+2x+1+(x^2+x-6)-4x
    =x^2+2x+1+x^2+x-6-4x
    =2x^2-x-5
    $#chúc tus học tốt!!$
    #La

  2. $\text{a)3}$$x^{2}.(2$ $x^{2}-5x-4)$
    $\text{=3}$$x^{2}.2$ $x^{2}-3$ $x^{2}.5x-3$ $x^{2}.4$
    $\text{=6x}$$^{4}-15$ $x^{3}-12$ $x^{2}$
    $\text{b)(x+}$$1)^{2}+(x-2).(x+3)-4x$$\text{=}$$x^{2}+2x+1+$ $x^{2}+3x-2x-6-4x$
    $\text{=2}$$x^{2}-x-5$
    $\text{#mct}$
     

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