總價 跳隔二二相乘 後相加 (10879)


M3=SUMPRODUCT(SUBTOTAL(6,OFFSET(A3,,ROW($1:$4)*3-3,,2)))


另解=SUMPRODUCT(N(OFFSET(A3,,ROW($1:$4)*3-3))*N(OFFSET(B3,,ROW($1:$4)*3-3)))


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