1+(-2)+(-3)+4+5+(-6)+(-7)+8+……+2001+(-2002)+(-2003)+2004
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1+(-2)+(-3)+4+5+(-6)+(-7)+8+……+2001+(-2002)+(-2003)+2004
1+(-2)+(-3)+4+5+(-6)+(-7)+8+……+2001+(-2002)+(-2003)+2004
1+(-2)+(-3)+4+5+(-6)+(-7)+8+……+2001+(-2002)+(-2003)+2004
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9()2()7()8()()()()4()()9()6()1 3()5()()()()24()()8 5()()1()()8 9 4()1 6 7()()1()()3 6()()88()()()()2()3 6()5
()3( ) × ( )6 ------------- 1 ( )( ) 6( ) ( ) 5------------- 8 ( )( ) ( )()3( ) × ( )4 ------------- 2 ( )2 8( )1 ( ) 0------------- 3 ( ) 1 ( ) 8
(1 3 5 .1991)-(2 4 6 .1990)
2/3,1,6/5,4/3,( ),3/2
(1 ) -2*3*(-4) (2) -6*(-5)*(-7)
1+(-2)+3+(-4)+5+(-6)+.+(+99)+(-100)=?
计算:1+(-2)+(-3)+4+5+(-6)+(-7)+8+...+(-2009)+2010
3+(-5)+(-2)+14+(-6)+(-1)+(-4)
(-1/4)+5/6+2/3-1/2
(1-3/(2*4))×(1-3/(3*5))×(1-3/(4*6))×.×(1-3/(97*99))=?
1/(1×2×3)+1/(2×3×4)+1/(4×5×6)、、、、+1/(48×49×50)
用下列各数组成比例 1,2,3,4,5,6,9,15( ):( )( ):( )( ):( )( ):( )( ):( )( ):( )( ):( )
有理数的加减法..我就是想看看我对了没..(1)(-10)+(+6)(2)(+12)+(-4)(3)(-5)+(-7)(4)(+6)+(-9)(5)(-0.9)+(-2.7)(6)2/5+(-3/5)(7)(-1/3)+2/5(8)(-3又1/4)+(-1
1()2()3()4()5()6()7()8()9=36填“+”,“-”
1).3/1+(—6/5) 2).27-18+(-7)-32 3).0.5+(-4/1)-(-2.75)+2/1 4).33.1-(22..9)+(-10.5)5).(-8)-(-15)+(-9)-(-120)6).-3/2+(-6/1)-(-4/1)-2/1 7).5/3-2/3+(—4/11)+4/13
(-2000 5/6)+(-1999 2/3)+4000 3/4 +(-1 1/2)
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?