具体过程`
第1个回答 2007-12-27
很简单,两项两项算,X-(X+Y)=-Y,(X+2Y)-(X+3Y)=-Y,
(X+4Y)-(X+5Y)=-Y,……等到(X+100Y)-(X+101Y)=-Y,一共有56个(-Y),等式就等于56*(-Y)=-56/3.
(X+4Y)-(X+5Y)=-Y,……等到(X+100Y)-(X+101Y)=-Y,一共有56个(-Y),等式就等于56*(-Y)=-56/3.
第2个回答 2007-12-27
x-(x+y)+(x+2y)-(x+3y)……--(x+101y)
=(x-(x+y))+((x+2y)-(x+3y))+……--(x+101y))
=-y+(-y)+...+(-y)
=-51y
=-51*(1/3)
=-17本回答被提问者采纳
=(x-(x+y))+((x+2y)-(x+3y))+……--(x+101y))
=-y+(-y)+...+(-y)
=-51y
=-51*(1/3)
=-17本回答被提问者采纳