[1+x-y][x+y-1]计算题
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[1+x-y][x+y-1]计算题[1+x-y][x+y-1]计算题[1+x-y][x+y-1]计算题[1+x-y][x+y-1]=[x+(y-1)]*[x-(y-1)]=x²-(y-1)&
[1+x-y][x+y-1]计算题
[1+x-y][x+y-1]计算题
[1+x-y][x+y-1]计算题
[1+x-y][x+y-1]
=[x+(y-1)]*[x-(y-1)]
=x²-(y-1)²
=x²- y²+2y - 1
原式=(x)平方-(y-1)平方=x平方-y平方+2y-1
[1+x-y][x+y-1]
=[x+(1-y)][x-(1-y)]
=x^2-(1-y)^2
=x^2-y^2+2y-1
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