当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?
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当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?当a
当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?
当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?
当a+b=3,x-y=1时,代数式a²+2ab+b²-x+y+1997的值是?
a²+2ab+b²-x+y+1997
=(a+b)²-(x-y)+1997
=3²-1+1997
=8+1997
=2005
担心不显示平方符号,图片格式为