若实数x,y满足(x-y-5)²+│2x+3y+20│=20,求3x+2y+1的值.同上:若实数x,y满足(x-y-5)²+│2x+3y+20│=20,求3x+2y+1的值.
问题描述:
若实数x,y满足(x-y-5)²+│2x+3y+20│=20,求3x+2y+1的值.
同上:若实数x,y满足(x-y-5)²+│2x+3y+20│=20,求3x+2y+1的值.
答
此题等式右边应该是0吧,不然此题就有无数组解.如果是0的话,由(x-y-5)²≥0,│2x+3y+20│≥0知,要使等式成立必有(x-y-5)²=0且│2x+3y+20│=0,那么3x+2y+1=-14