（x+2)(y+3)-(x+1)(y-2)
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（x+2)(y+3)-(x+1)(y-2)
=xy+3x+2y+6-(xy-2x+y-2)
=xy+3x+2y+6-xy+2x-y+2
=xy-xy+3x+2x+2y-y+2+6
=5x+y+8
=xy+3x+2y+6-(xy-2x+y-2)
=xy+3x+2y+6-xy+2x-y+2
=xy-xy+3x+2x+2y-y+2+6
=5x+y+8
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(x+2)(y+3)-(x+1)(Y-2)
=xy+3x+2y+6-(xy-2x+y-2)
=xy+3x+2y+6-xy+2x-y+2
=5x+y+8
=xy+3x+2y+6-(xy-2x+y-2)
=xy+3x+2y+6-xy+2x-y+2
=5x+y+8
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（x+2)(y+3)-(x+1)(y-2)
=xy+3x+2y+6-xy+2x-y+2
=5x+y+8
=xy+3x+2y+6-xy+2x-y+2
=5x+y+8
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