1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)
[1-(1-0.5×三分之一]×[2-(-3)²]
简便计算:★[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)]+……+[1/2012+(-1/20
∫[1,3](2x-1/x²)dx
(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/10²)
计算[a-(a/a+1)]÷(a²-2a)/(a²-4)×(a+1)/(a²+3a+2)
[(2/3-1/4)÷5/6+4/5]X5/11
─3[(a²+1)─1/6(2a²+a)+1/3(a─5)].
用简便方法计算 (1/2²-1)(1/3²-1)(1/4²-1)...(1/10²
-0.25²÷(-1/2)³+(1/3-1/2)×(-1)
(1-1/2²)(1-1/3²)(1-1/4²)...(1-1/9²)(1-1/
利用因式分解计算:(1-1/2²)(1-1/3²)(1-1/4²)
1/4²÷(-1/2)的四次方×(-1)的十次方-(1 3/8+1 1/3-2 3/4)÷24=?