Question

请解答六年级数学题：2／15÷（1．1－3／4）＋1／5X3／5

请解答者尽量详细解答．

Answer 1

2／15÷（1．1－3／4）＋1／5X3／5
=2/15÷(1.1-0.75)+3/25
=2/15÷0.35+3/25
=2/15÷3/20+3/25
=2/15X20/3+3/25
=8/9+3/25
=200/225+27/225
=227/225

Answer 2

都化为分式：
2/15÷（11/10-3/4）+3/25
=2/15÷（44/40-30/40）+3/25
=2/15÷14/40+3/25
=2/15x40/14+3/25
=8/21+3/25
=(200+63)/21x25
=263/525
=0.5

Answer 3

2／15÷（1．1－3／4）＋1／5X3／5
=2/15÷7/20+3/25
=8/21+3/25
=200/525+63/525
=263/525

Answer 4

2／15÷（1．1－3／4）＋1／5X3／5
=2/15÷(22/20-15/20)+3/25
=2/15÷7/20+3/25
=2/15*(20/7)+3/25
=40/105+3/25
=200/525+63/525
=263/525

Answer 5

2／15÷（1．1－3／4）＋1／5X3／5
=2／15÷（22/20-15/20)+3/25
=2/15*20/7+3/25
=8/21+3/25
=200/525+63/525
=263/525