1、已知根号2x-1+|y+1|=0,求x²+y²的值

问题描述:

1、已知根号2x-1+|y+1|=0,求x²+y²的值
2、已知y=根号x²-4+根号4-x²+1/x-2,求3x+4y的值

(1)分析:两个非负数和为零,必须各自为零即2x-1=0,y+1=0解得:x=1/2,y=-1带入:(1/2)^2+(-1)^2=1/4-1/2=-1/4(2)分析:二次根式必须被开方数大于等于零所以,根据题意可得:x^2-4≥0且4-x^2≥0,∴x^2=4,则x=2或x=-2...