б) (a-b)(x+y)=ax+ay-bx-by
г) (x+8)(y-1)=xy-1x+8y-8
е)(-a+y)(-1-y)=1a+ay-1y-yx^{2}
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б) (a-b)(x+y)=ax+ay-bx-by
г) (x+8)(y-1)=xy-1x+8y-8
е)(-a+y)(-1-y)=1a+ay-1y-yx^{2}