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

Toán Lớp 8: Rút gọn phân thức sau: $(3-2x)(x+1)+x(2x-1)$

Toán Lớp 8: Rút gọn phân thức sau:
$(3-2x)(x+1)+x(2x-1)$

Comments ( 2 )

  1. Giải đáp:
     (3-2x)*(x+1)+x*(2x-1)=3x+3-2x^2-2x+2x^2-x=(-2x^2+2x^2)+(3x-2x-x)+3=0+3=3
     

  2. Giải đáp:
     $(3-2x).(x+1)+x.(2x-1)$
    $= 3x+3-2x^2-2x+2x^2-x$
    $= (3x-2x-x)+(2x^2-2x^2)-3$
    $= -3$
     

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