A. 对 B. 错
A. =AVERAGE (B2:B4) B. =SUM(B2:B4) C. =AVERAGE(B2,B3,B4) D. =(B2+B3+B4)/3
A. =Sheet2!B2+Sheet1!A2 B. =SUM(Sheet2!A1:A8) C. =SUM(a1:a7, b1,b5) D. =SUM(A1;A7)