(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
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(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-
(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
原式
= (1 - 3) + (5 - 7) + ...+ (2005 - 2007) + (2009 - 2011)
= (-2) + (-2) + ...+ (-2) + (-2)
= (-2) × 503
= -1006
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() 4 () () 5 () ()()()() 6 9 () 7 1 ()()()2 ()() ()()() () 1 ()()()() 8 ()() 1 ()()() 7 () ()() 9 ()()()()() 3
(-5)*(+7 1/3)+(+7)*(-7 1/3)-(+12)*7 1/3 简便方法计算
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求九宫格答案2()()()9()()()4 ()8()76()()3()()()7()1()5()6 531()()()42()9()()8()56()7()7()()413()()()()9()8()25(
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(1).6(x/3+x-1/2 ) (2).(7-3a)+(5a-6) (3).(x-3)-(5x+7)
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