已知实数a.b满足a ＞＝0,b ＞＝0,a -b +1＞＝0,则z =a +b.的取值范围是多少

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已知实数a.b满足a ＞＝0,b ＞＝0,a -b +1＞＝0,则z =a +b.的取值范围是多少
已知实数a.b满足a ＞＝0,b ＞＝0,a -b +1＞＝0,则z =a +b.的取值范围是多少

已知实数a.b满足a ＞＝0,b ＞＝0,a -b +1＞＝0,则z =a +b.的取值范围是多少
a - b ≥ -1
a ≥ b-1
所以当a取最小值0的时候 b最小值为1 所以b的实际取值范围是 b≥1
所以z=a+b 的取值范围是 z ≥1

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