3/5+1/2-7/8 ,5/9+2/3+4/9+4/3,1-1/2-1/4-1/8-1/16。
3个回答
展开全部
3/5+1/2-7/8
=11/10-7/8
=9/40
5/9+2/3+4/9+4/3
=(5/9+4/9)+(2/3+4/3)
=1+2
=3
1-1/2-1/4-1/8-1/16
=1+1-1/2+1/2-1/4+1/4-1/8+1/8-1/16
=2-1/16
=1又15/16
=11/10-7/8
=9/40
5/9+2/3+4/9+4/3
=(5/9+4/9)+(2/3+4/3)
=1+2
=3
1-1/2-1/4-1/8-1/16
=1+1-1/2+1/2-1/4+1/4-1/8+1/8-1/16
=2-1/16
=1又15/16
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2020-07-10 · 知道合伙人教育行家
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展开全部
3/5+1/2-7/8
=24/40+20/40-35/40
=9/40
==============
5/9+2/3+4/9+4/3
= (5/9+4/9)+(2/3+4/3)
= 9/9+6/3
= 1+2
= 3
==============
1-1/2-1/4-1/8-1/16
=1/2-1/4-1/8-1/16
=1/4-1/8-1/16
=1/8-1/16
=1/16
=24/40+20/40-35/40
=9/40
==============
5/9+2/3+4/9+4/3
= (5/9+4/9)+(2/3+4/3)
= 9/9+6/3
= 1+2
= 3
==============
1-1/2-1/4-1/8-1/16
=1/2-1/4-1/8-1/16
=1/4-1/8-1/16
=1/8-1/16
=1/16
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