一、1/3+8/1+15/1+24/1=?
解:1*1/3+1/2*1/4+1/3*1/5+1/4*1/6
=4*1/4*1/6+6*1/3*1/5
=1/6+2/5
=17/30
(注:*=乘号)
(注:1*1/3是1/3*1/5的五份,将它看作5个1/3*1/5,加上1个1/3*1/5就是6个,所以要用6*1/3*1/5。1/2*1/4中有3个1/4*1/6,将它看作3个1/4*1/6,加上1个1/4*1/6就是4个,所以要用4*1/4*1/6。)
二、1/3+1/15+3/24+1/24(即将1/8通分)
=1/3+1/15+1/6(4/24)
=1/15+1/2(即1/3通分为2/6再同1/6相加)
=2/30+15/30
=17/30
1/3+1/15+3/24+1/24(即将1/8通分)
=1/3+1/15+1/6(4/24)
=1/15+1/2(即1/3通分为2/6再同1/6相加)
=2/30+15/30
=17/30
1/3+1/8+1/15+1/24
=(1/3+1/15)+(1/8+1/24)
=(5/15+1/15)+(3/24+1/24)
=6/15+1/6
=12/30+5/30
=17/30
可能不是最最简单的,不过这个也不赖。
1/3+1/8+1/15+1/24
=1/3+1/8+1/24+1/15
=8/24+3/24+1/24+1/15
=12/24+1/15
=1/2+1/15
=15/30+1/30
=16/30
=8/15
8/24+3/24+1/15+1/24
=12/24+1/15
=1/2+1/15
=15/30+2/30
=17/30