8张卡片|三年级奥数题及答案
如图9-10，有8张卡片，上面分别写着自然数1至8。从中取出3张，要使这3张卡片上的数字之和为9。问有多少种不同的取法?
nmousewheel="return bbimg(this)" border=0 hspace=0 alt="" href="https://www.mshxw.com/file/tupian/20210205/2013042314535877.png" data-fancybox="images">nmousewheel="return bbimg(this)" border=0 hspace=0 alt="" src="https://www.mshxw.com/file/tupian/20210205/2013042314535877.png" o
nload=resizepic(this)>
【答案】
nmousewheel="return bbimg(this)" border=0 hspace=0 alt="" href="https://www.mshxw.com/file/tupian/20210205/2013042314540933.png" data-fancybox="images">nmousewheel="return bbimg(this)" border=0 hspace=0 alt="" src="https://www.mshxw.com/file/tupian/20210205/2013042314540933.png" o
nload=resizepic(this)>
