八年级上册数学问题(1题)(请详解)1.若一次函数y=ax+b经过点(x1,y1)和(x2,y2),且k大于0,b小于0,则当x1小于0小于x2,有A.y1大于b大于y2 B.y1小于b小于y2 c.y1小于y2小于0 D.y1大于y2大于0

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