99x12十12

114网址导航m ;(2)解方程C 16
x2-x =C 16
5x-5 ;(3)计算C 10
2 +…+C 100
妮绮傰7ltNG
(1)由已知得
,化简得m 2 -23m+42=0,解得m=2或21,但0≤m≤5,故m=2.∴
=28 .(2)原方程可化为x 2 -x=5x-5或x 2 -x=16-(5x-5),即x 2 -6x+5=0或x 2 +4x-21=0,解得x=1或x=5或x=-7或x=3,经检验x=5或x=-7不合题意,故原方程的根为x=1或x=3.(3)原式=(C 11
2 +…+C 100
99 =(C 12
2 )+…+C 100
99 =(C 13
3 )++C 100
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