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?](/uploads/image/z/2662018-34-8.jpg?t=%E5%BD%93a%EF%BC%8Bb%3D3%2Cx%EF%BC%8Dy%3D1%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8Fa%26%23178%3B%EF%BC%8B2ab%EF%BC%8Bb%26%23178%3B%EF%BC%8Dx%EF%BC%8By%EF%BC%8B1997%E7%9A%84%E5%80%BC%E6%98%AF%3F)
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