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

Toán Lớp 8: X^2-xy+x-y X^2+4x-y^2+4

Toán Lớp 8: X^2-xy+x-y X^2+4x-y^2+4

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a)x^2-xy+x-y
    =(x²-xy)+x-y
    =x(x-y)+(x-y)
    =(x-y)(x+1)
    b)x²+4x-y²+4
    =(x²+4x+4)-y²
    =(x+2)²-y²
    =(x+2+y)(x+2-y)
     

  2. a, x^2 – xy + x – y
    = x.(x-y) + (x-y)
    = (x-y).(x+1)
    $b,$ $x^2+4x-y^2+4$
    $=\left(x^2+4x+4\right)-y^2$
    $=\left(x+2\right)^2-y^2$
    $=\left(x+2-y\right).\left(x+2+y\right)$
     

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