

+5000times 3.25% times 2=-|||-div 25% =-|||--500times 20% =-|||-+3500times 2.25%
[单选题]:9,1,( ),9,25,49。A.1B.2C.4D.5
填空-|||-dfrac (1)(3)times 3div dfrac (1)(3)times 3= __
已知DX=9, DY=25,(1)若X与Y相互独立;(2)若DX=9, DY=25,求DX=9, DY=25已知,(1)若X与Y相互独立;(2)若,求
11设 9.ipg-|||-OA dfrac (5)(9)-|||-CB dfrac (1)(9)-|||-oc dfrac (4)(9)-|||-dfrac
[单选题]143 59 25 9 7 ( )A . -2B . -3C . -4D . -5
计算:(1)(-0.02)times (-20)times (-5)times 4.5;(2)(-6.5)times (-2)div (-dfrac(1)(3)
2.脱式计算。-|||-times dfrac (97)(99)-|||-dfrac (10)(21)times dfrac (7)(20)div dfrac
[单选题]1,4,9,25,64,( )。A.81B.100C.121D.169
[试题]5,7,,4,9,25,()A.72B256C49D169