问题
解答题
若|x﹣3|与(y+1)2互为相反数,求x3﹣y3的值
答案
解:∵|x﹣3|与(y+1)2互为相反数,|x+2|≥0,(y﹣3)2≥0,
∴|x﹣3|=0,(y+1)2=0,
解得x=3,y=﹣1,
∴x3﹣y3
=33﹣(﹣1)3
=28.
若|x﹣3|与(y+1)2互为相反数,求x3﹣y3的值
解:∵|x﹣3|与(y+1)2互为相反数,|x+2|≥0,(y﹣3)2≥0,
∴|x﹣3|=0,(y+1)2=0,
解得x=3,y=﹣1,
∴x3﹣y3
=33﹣(﹣1)3
=28.