4.25 3.25＋(－2又5/3)＋5又2/3＋（－8.6）求助啊！

3.25＋(－2又5/3)＋5又2/3＋（－8.6）求助啊！  

3.25＋(－2又5/3)＋5又2/3＋（－8.6）求助啊！

3.25＋(－2又5/3)＋5又2/3＋（－8.6）
=3.25+5-2-8.6-(5/3-2/3)
=8.25-10.6-1
=-3.35

（-2005又5/6）+（-2004又2/3）+4010又2/3+（-1又1/2）

347

(-2000又5/6)+(-1999又2/3)+4000又2/3+(-1又1/2)

(-2000又5/6)+(-1999又2/3)+4000又2/3+(-1又1/2)
=(-2000-1999+4000-1) +(-5/6-2/3+2/3-1/2)
=0-5/6-1/2
=-4/3

8/3×(3.25÷5/12+2.4+3.75×2又 2/5)

8/3×(3.25÷5/12+2.4+3.75×2又 2/5)=8/3x（3.25x12/5+2.4+3.75x12/5）=8/3x（2.4+7x12/5）=8/3x2.4+8/3x84/5=6.4+44.8=51.2。

拆项法：(-2010又5/6）+（-2009又2/3）+4020又2/3+（-1又1/2）= ？

解：(-2010又5/6）+（-2009又2/3）+4020又2/3+（-1又1/2）
=（-2010-2009+4020-1）+（-5/6-2/3+2/3-1/2）
=-5/6-1/2
=-4/3

计算（-2012又5/6）+（-2011又2/3）+4024又2/3+（-1又1/2）

（-2012又5/6）+（-2011又2/3）+4024又2/3+（-1又1/2）
=[(-2012又5/6)+(-1又1/2)]+[(-2011又2/3)+4024又2/3]
=(-2014又1/3)+2013
=-1又1/3

2/3+(5/6+2.8+1/3)-(2又4/5+5/6)

2/3+(5/6+2.8+1/3)-(2又4/5+5/6)
=2/3+5/6+2.8+1/3-2又4/5-5/6
=2/3+2.8+1/3-2.8
=1

用拆项法，计算：（-1000又5/6）+（-1999又2/3）+4000又2/3+（-1又1/2）的值.

原式=（-1000-1999+4000-1）+（-5/6-2/3+2/3-1/2）=1000-4/3=998又1/3

5/16乘80％除5/6 2又2/3除4/5 2又2/3除4/5-1/3

5/16×80％÷5/6
=1/4÷5/6
=3/20
2又2/3÷4/5
=8/3×5/4
=10/3
2又2/3÷4/5-1/3*0.75
=10/3-1/4
=37/12
75％×（1.5-2/3）+1.2÷4/3
=75％×5/6+0.9
=0.625+0.9
=1.525

5/13*[1又2/5+(6.5-2又1/3)/1又2/3]=?

5/13×[1又2/5+(6.5-2又1/3)/1又2/3]
=5/13×[7/5+(13/2-7/3)×3/5]
=5/13×[7/5+(39/6-14/6)×3/5]
=5/13×(7/5+25/6×3/5)
=5/13×(7/5+5/2)
=5/13×(14/10+25/10)
=5/13×39/10
=3/2