数学分式应用题1.甲乙承包一项工程,合作b天能完成,甲单独做需要a天完成,则以单独完成这项工程需要的天数是( )A.a-b B.1/a-b C.ab/a-b D.1/b-1/a,望大哥们给我讲讲过程!2.把a克糖溶解到b克水中,

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