|-0.2|-|(-3)-(+8)|-|-8-2+10|求得数,要有完整过程PS:要先把减号变成加号!
|-0.2|-|(-3)-(+8)|-|-8-2+10|
=0.2-|-11|-|0|
=0.2-11-0
=-10.8
5.75-(-3/8)+(-0.5)-(-5/6)+4 2/3-1/8 (4 2/3是4又3分之2)要求同上
5.75-(-3/8)+(-0.5)-(-5/6)+4 2/3-1/8
=5.75+3/8-0.5+5/6+4+2/3-1/8
=5.75+(3/8-1/8)-0.5+(5/6+2/3)+4
=5.75+0.25-0.5+1.5+4
=6+1+4
=11
若|a|=3,|b|=1,|c|=5,且|a+b|=a+b,|a+c|=-(a+c),求a-b+c的值.(算式要有)
|a|=3,|b|=1,|c|=5
则a=±3,b=±1,c=±5
又已知|a+b|=a+b,|a+c|=-(a+c),
所以a=3,b=±1,c=-5
a-b+c=3+1-5=-1
或a-b+c=3-1-5=-3
|1/2-1|+|1/3-1/2|+|1/4-1/3|+.+|1/2010-1/2009|..求得数(算式)
|1/2-1|+|1/3-1/2|+|1/4-1/3|+.+|1/2010-1/2009|
=1-1/2+1/2-1/3+1/3-1/4+...+1/2009-1/2010
=1-1/2010
=2009/2010