(1-2)(2-3)(3-4)(4-5)····(2003-2004) 咋算
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(1-2)(2-3)(3-4)(4-5)····(2003-2004) 咋算
(1-2)(2-3)(3-4)(4-5)····(2003-2004) 咋算
(1-2)(2-3)(3-4)(4-5)····(2003-2004) 咋算
原式=(-1)(-1)(-1).=(-1)^2003=-1
(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)(1-3)(3-4)(4-5)...(19-20)=
4×(-1/2²)-3/2×(-2/5)
1()2()3()4
1/2+(-2/3)-(-4/5)+(-1/2)-(+1/3)
(-1)*(-2)*(-3)+(-2)*(-3)*(-4)+(-3)*(-4)*(-5)+~+(-100)*(-101)*(-102)
()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(
5/9+(3/4-1/2)
4/5+(3/8-1/2)
计算 (-1)+(+2)+(-3)+(+4)+(-5)+.+(-2009)+(+2010)
(-1)+(+2)+(-3)+(+4)+(-5)+...+(-2011)+(+2012)
-3²×(-3)² (-1/2)×(-2/3)×(-3/4)×(-4/5)-3²×(-3)² (-1/2)×(-2/3)×(-3/4)×(-4/5)
(2/3-4/5+1/2)÷(-15)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)