999 4/5+99 4/5+9 4/5+3/5用简便方法计算怎样算
问题描述:
999 4/5+99 4/5+9 4/5+3/5用简便方法计算怎样算
答
999 4/5+99 4/5+9 4/5+3/5……把3/5拆分成:(1/5+1/5+1/5)
=(9994/5+1/5)+(994/5+1/5)+(94/5+1/5)
=9995/5+995/5+95/5
=1999+199+19
=2000+200+20-3
=2220-3
=2217