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B1:C4 B1:C2,C3:C4 B1:C2:C4 B1:C2C3:C4
{1,2,3}∪{4,5,6} {5,5,6,6,7,7,8,8,9,9} {5,6,7,8,9} {5,7,9}
=AVERAGE(B1+B2+B3) =AVERAGE(B1/3,B2/3,B3/3) =(B1+B2+B3)/3 =AVERAGE(A1:B3 B1:C3)
C1、C2、C3、C4、C5、D、E、F C1、C2、B1、B2 A1、A2、A3、B1 A1、A2、B1、B2
={x|x2﹣4<0}, ={1,2,3},则A∩B.=( ) A.{1,2,3} B.{1,2} {1} {2}
={1,2,3}, ={2,5,6},则A.∩(∁U.B.)等于( ) A.{2}B.{2,3} {3} {1,3}
insert into tvalues(null,2,3) insert into tvalues(1,2,3) insert into t(C2)values(2) insert into t(C3)values(3)
={1,2}, ={1,2,3},C={2,3,4}则 ( ) (A.) {1,2,3} (B.) {1,2,4} ( ) {2,3,4} ( ) {1,2,3,4}
={1,2,3}, ={2,3,4},则A.∪B.=( ) A. {1,2,3,4} B. {1,2,3} {2,3,4} {1,3,4}