(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4).(1+1/99)x(1-1/99)=?
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(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4).(1+1/99)x(1-1/99)=?(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+
(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4).(1+1/99)x(1-1/99)=?
(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4).(1+1/99)x(1-1/99)=?
(1+1/2)x(1-1/2x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4).(1+1/99)x(1-1/99)=?
=3/2*1/2*4/3*2/3*5/4*3/4*……*100/99*98/99
liuking123
=(3/2*4/3*5/4*……*100/99)*(1/2*2/3*3/4*……98/99)
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(3/2*4/3*5/4*……*100/99)每一项的分子与后面一项分母抵消!liuking123
(1/2*2/3*3/4*……98/99)每项分母与后面项分子抵消!
=100/2*1/99
liuking123
=50/99
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
七年级下册政治复习提纲(山东人民出版社)第五单元是 青春的脚步 青春的气息别弄错了啊!格式:X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X.
分解因式----(X*X-X)(X*X-X-2)+1
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