使用SUMIF和间接给出#REF的excel SUMPRODUCT !错误

I have 3 sheets K1,K2,K3:

我有3张K1 K2 K3

SHEET1
A 10
B 10     
C 10

SHEET2
A 5
B 1     
C 2
RESULT :
A  15
B  11
C  12 
SHEE