若x² +|y-2|=0,求代数式x³-x²y+xy²+x²y-xy²-y³的值.若|a-1|+(b-2)²=0,求多项式3a²-6ab+b²+a²-5的值.礼堂第1排有a个座位,后面每排都比前一排多1个座位.(1).第二
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![若x² +|y-2|=0,求代数式x³-x²y+xy²+x²y-xy²-y³的值.若|a-1|+(b-2)²=0,求多项式3a²-6ab+b²+a²-5的值.礼堂第1排有a个座位,后面每排都比前一排多1个座位.(1).第二](/uploads/image/z/611731-19-1.jpg?t=%E8%8B%A5x%26%23178%3B+%2B%7Cy-2%7C%3D0%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8Fx%26%23179%3B-x%26%23178%3By%2Bxy%26%23178%3B%2Bx%26%23178%3By-xy%26%23178%3B-y%26%23179%3B%E7%9A%84%E5%80%BC.%E8%8B%A5%7Ca-1%7C%2B%EF%BC%88b-2%EF%BC%89%26%23178%3B%3D0%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F3a%26%23178%3B-6ab%2Bb%26%23178%3B%2Ba%26%23178%3B-5%E7%9A%84%E5%80%BC.%E7%A4%BC%E5%A0%82%E7%AC%AC1%E6%8E%92%E6%9C%89a%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C%E5%90%8E%E9%9D%A2%E6%AF%8F%E6%8E%92%E9%83%BD%E6%AF%94%E5%89%8D%E4%B8%80%E6%8E%92%E5%A4%9A1%E4%B8%AA%E5%BA%A7%E4%BD%8D.%EF%BC%881%EF%BC%89.%E7%AC%AC%E4%BA%8C)
若x² +|y-2|=0,求代数式x³-x²y+xy²+x²y-xy²-y³的值.若|a-1|+(b-2)²=0,求多项式3a²-6ab+b²+a²-5的值.礼堂第1排有a个座位,后面每排都比前一排多1个座位.(1).第二
若x² +|y-2|=0,求代数式x³-x²y+xy²+x²y-xy²-y³的值.
若|a-1|+(b-2)²=0,求多项式3a²-6ab+b²+a²-5的值.
礼堂第1排有a个座位,后面每排都比前一排多1个座位.
(1).第二排有_____个座位,第三排有_____个座位;
(2).若第n排的座位数为m,试用含n的代数式表示m,并计算当a=20,n=19是m的值.
若x² +|y-2|=0,求代数式x³-x²y+xy²+x²y-xy²-y³的值.若|a-1|+(b-2)²=0,求多项式3a²-6ab+b²+a²-5的值.礼堂第1排有a个座位,后面每排都比前一排多1个座位.(1).第二
题一
据题意得,X=0,Y-2=0,
即X=0,Y=-2
原式=-8
题二
据题意得,a-1=0,b-2=0,
即a=-1,b=-2
原式=3-12+4+1-5
=-9
题三
(1)(a+1),(a+2)
(2)m=a+n-1
当a=20,n=19
m=20+19-1
=38
(1)a+1;a+2 (2)a(n-1)=m 当a=20,n=19时,