简单数学题一道

2025-12-06 02:54:50
推荐回答(3个)
回答1:

101
11*66+12*67+13*68+14*69+15*70
=(11*65+12*66+13*67+14*68+15*69)+(11+12+13+14+15)
原式=100+(11+12+13+14+15)*100/(11*65+12*66+13*67+14*68+15*69 )
=101+
(11*35+12*34+13*33+14*32+15*31)/(11*65+12*66+13*67+14*68+15*69 )

回答2:

101

回答3:

[11*(65+1)+12*(66+1)+13*(67+1)+14*(68+1)+15*(69+1)]*100
=(11*65+12*66+13*67+14*68+15*69)*100+(11+12+13+14+15)*100

a=100+(11*100+12*100+13*100+14*100+15*100)/(11*65+12*66+13*67+14*68+15*69)

11*100+12*100+13*100+14*100+15*100
=11*(65+35)+12*(66+34)+13*(67+33)+14*(68+32)+15*(69+31)
= (11*65+12*66+13*67+14*68+15*69) + (11*35+12*34+13*33+14*32+15*31)

a= 101 + (11*35+12*34+13*33+14*32+15*31)/(11*65+12*66+13*67+14*68+15*69 )

又(11*35+12*34+13*33+14*32+15*31)/(11*65+12*66+13*67+14*68+15*69 )<1

答:101