1. (1-2)X(2-3)X(3-4)X(4-5)X,,,,,,,,X(2007-2008)= (-1)2007=-1 2. -1/63(63分之1)1/120 (-1)n/n(n+2) 3. 设用x张制盒身 16x=(150-x)×43/2 x=86 (盒身) 120-86=34 (盒底) 4.(1-4*1/20)/(1/20+1/12)=6
解密初中数学题目。1.计算(1-2)X(2-3)X(3-4)X(4-5)X,,,,,,,,X(2007-2008)= ?
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