(1)设甲树苗购买了x株,乙树苗购买1000-x株,则
25x+(1000-x)*30=28000,25x+30000-30x=28000,5x=2000,x=400株,乙树苗=1000-400=600株
(2)设甲树苗购买x株时总成活率是92%,则
[x*90%+(1000-x)*95%]/1000*100%=92%,x=600,甲树苗最多购买600株
(3)满足...
(1)设甲树苗购买了x株,乙树苗购买1000-x株,则
25x+(1000-x)*30=28000,25x+30000-30x=28000,5x=2000,x=400株,乙树苗=1000-400=600株
(2)设甲树苗购买x株时总成活率是92%,则
[x*90%+(1000-x)*95%]/1000*100%=92%,x=600,甲树苗最多购买600株
(3)满足...