|-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!

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  • |-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