(-12又1/2)-【-(+6.5)-(-6.3)-6又1/5】 (-4又1/2)-{3又2/5-【(-0.13)-(0.33)】}

-15又1/3-3又1/7-4又2/3+8又1/7
2又1/2-(+2又2/3)+4又1/7-(-2又1/2)-(+1又1/7)
13/17+(-200.5)-(-6)-(199.5)-(+4/17)
12又1/4-(+1.75)-(-5又1/2)+(-7.25)-(-2又3/4)-2.5
7又3/4+(-9又5/8)+(-5又1/2)+3/8+(-4又1/2)
-32又1/3-5又1/4-(-3又1/7)+3.25+2又6/7+丨-28又1/3丨

(-12又1/2)-【-(+6.5)-(-6.3)-6又1/5】
=-12.5-【-6.5+6.3-6.2】
=-12.5-【-6.4】
=-12.5+6.4
=-6.1

(-4又1/2)-{3又2/5-【(-0.13)-(0.33)】}
= (-4又1/2)-{3又2/5-【-0.13-0.33】}
= (-4.5)-{3.4+0.46}
= -4.5-3.86
=-8.36
-15又1/3-3又1/7-4又2/3+8又1/7
=-15又1/3-4又2/3+8又1/7-3又1/7
=-20+5
=-15
2又1/2-(+2又2/3)+4又1/7-(-2又1/2)-(+1又1/7)
=2又1/2- 2又2/3+4又1/7 +2又1/2-1又1/7
=2又1/2 +2又1/2- 2又2/3+4又1/7-1又1/7
=5- 2又2/3+3
=5又1/3

13/17+(-200.5)-(-6)-(199.5)-(+4/17)
=13/17-200.5 +6-199.5-4/17
=13/17-4/17-200.5 -199.5+6
=9/17-394
=-393又8/17
12又1/4-(+1.75)-(-5又1/2)+(-7.25)-(-2又3/4)-2.5
=12.25-1.75+5.5-7.25+2.75-2.5
=12.25-7.25+5.5-2.5+2.75-1.75
=5+3+1
=9
7又3/4+(-9又5/8)+(-5又1/2)+3/8+(-4又1/2)
=7又3/4-9又5/8-5又1/2+3/8-4又1/2
=7又6/8-9又5/8+3/8-5又1/2-4又1/2
=-1又4/8-10
=-11又1/2
-32又1/3-5又1/4-(-3又1/7)+3.25+2又6/7+丨-28又1/3丨
=-32又1/3-5又1/4+3又1/7+3又1/4+2又6/7+28又1/3
=-32又1/3+28又1/3-5又1/4+3又1/4+3又1/7+2又6/7
=-4-2+6
=0
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第1个回答  2012-10-21
(-12又1/2)-【-(+6.5)-(-6.3)-6又1/5】
=-12.5-【-6.5+6.3-6.2】
=-12.5-【-6.4】
=-12.5+6.4
=-6.1

(-4又1/2)-{3又2/5-【(-0.13)-(0.33)】}
= (-4又1/2)-{3又2/5-【-0.13-0.33】}
= (-4.5)-{3.4+0.46}
= -4.5-3.86
=-8.36
-15又1/3-3又1/7-4又2/3+8又1/7
=-15又1/3-4又2/3+8又1/7-3又1/7
=-20+5
=-15
2又1/2-(+2又2/3)+4又1/7-(-2又1/2)-(+1又1/7)
=2又1/2- 2又2/3+4又1/7 +2又1/2-1又1/7
=2又1/2 +2又1/2- 2又2/3+4又1/7-1又1/7
=5- 2又2/3+3
=5又1/3

13/17+(-200.5)-(-6)-(199.5)-(+4/17)
=13/17-200.5 +6-199.5-4/17
=13/17-4/17-200.5 -199.5+6
=9/17-394
=-393又8/17
12又1/4-(+1.75)-(-5又1/2)+(-7.25)-(-2又3/4)-2.5
=12.25-1.75+5.5-7.25+2.75-2.5
=12.25-7.25+5.5-2.5+2.75-1.75
=5+3+1
=9
7又3/4+(-9又5/8)+(-5又1/2)+3/8+(-4又1/2)
=7又3/4-9又5/8-5又1/2+3/8-4又1/2
=7又6/8-9又5/8+3/8-5又1/2-4又1/2
=-1又4/8-10
=-11又1/2
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