=SUM(INDIRECT("B1:B"&ROW())),

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=SUM(INDIRECT(

=SUM(INDIRECT("B1:B"&ROW())),
=SUM(INDIRECT("B1:B"&ROW())),

=SUM(INDIRECT("B1:B"&ROW())),
row返回公式所在行号,假设公式输入在第5行,那么row()返回5
"B1:B"&ROW()
得到"B1:B5"
INDIRECT将这个字符串变成引用,SUM对该引用求和.