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int N=5,b[N][N]; int a[1][2]={{1},{3}}; int c[2][ ]={{1,2},{3,4}}; int d[3][2]={{1,2},{3,4}};
={x|1={x|x2-2x-3≤0},则A.∩(∁R.B.)=( ) A.(1,4)B.(3,4) (1,3) (1,2)∪(3,4)
SUM(A1:4B1:C4) SUM(B1+4) SUM(B1+2,B3+B4) SUM(B1,2,B3,B4)
={x|1={x|x 2-2x-3≤0},则( ) A.(1,4)B.(3,4) (1,3) (1,2)U(3,4)
=AVERAGE(B1+B2+B3) =AVERAGE(B1/3,B2/3,B3/3) =(B1+B2+B3)/3 =AVERAGE(A1:B3 B1:C3)
A1*A3+C1*C3 A1*A2+C1*C2 B1*B3+C1*C3 A2*A3+C2*C3
={x|1<x<4},集合B ={x|-2x-3≤0}, 则A.∩(CRB)= A. .(1,4) (3,4) (1,3) .(1,2)∪(3,4)
={1,2},则∁UA等于( ) A.{3,4} {1,2} {0,1,2} {0,3,4}
int N=5,b; int a[1][2]={{1},{3}}; int c[2][ ]={{1,2},{3,4}}; int d[3][2]={{1,2},{3,4}};
=SUM(A1, B2: C3) =SUM(A1: C2) =SUM(A1, B2, C3) =SUM(A1: B2: C3)