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

Toán Lớp 8: Rút gọn biểu thức (x+3)(×-7)- x^2 + 10

Toán Lớp 8: Rút gọn biểu thức
(x+3)(×-7)- x^2 + 10

Comments ( 2 )

  1. (x+3)(x-7)- x^2 + 10
    =(x.x-7.x+3.x-3.7)-x^2+10
    =(x^2-7x+3x-21)-x^2+10
    =(x^2-4x-21)-x^2+10
    =x^2-4x-21-x^2+10
    =(x^2-x^2)-4x-(-21+10)
    =0-4x-11
    =-4x-11

  2. (x+3)(x-7)-x^2+10
    =(x^2-7x+3x-21)-x^2+10
    =x^2-4x-21-x^2+10
    =-4x-11
    _____
    #Wuang
     

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