(1) 1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?
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(1)1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?(1)1+(-2)+3+(
(1) 1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?
(1) 1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?
(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?
(1) 1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?
(1)-1-1-1……-1=-50
(2)原式=1-1/2000=1999/2000
-50
1999/2000
(1)-50 (2)1999/2000
望采纳!
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
-1-(-2)-(+3)+(-4)-(-5)
1/2+(-2/3)-(-4/5)+(-1/2)-(+1/3)
(1-2)(1-3)(3-4)(4-5)...(19-20)=
()2()()()()()8()()()8()5()1()()()1 5 8()4 6 2()2()()1 8 3()()5()()()()4()()()()8()()6 2 5 ()()()15 9 2 4 1 6 7 3 8(
(2*3*4*5)*(1/2-1/3-1/4-1/5)
(1)(4-5i)(5-i) (2)(1-3i)²
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
计算 (-1)+(+2)+(-3)+(+4)+(-5)+.+(-2009)+(+2010)
(-1)+(+2)+(-3)+(+4)+(-5)+...+(-2011)+(+2012)
5/9+(3/4-1/2)
4/5+(3/8-1/2)
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
4×(-1/2²)-3/2×(-2/5)
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=