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=SUM(Sheet2! A2:A7) =SUM(Sheet2! A2:Sheet2! A7) =SUM((Sheet2)A2:A7) =SUM((Sheet2)A2:(Sheet2)A7)
ΔH>0 ΔH<0 ΔH=(Ea1-Ea2)/2 不能确定
=SUM(Sheet2!A2:A7) =SUM(Sheet2!A2:Sheet2!A7) =SUM((Sheet2)A2:A7) =SUM((Sheet2)A2:(Sheet2)A7)
=A2 + 成绩为 + B2 =A2 + “成绩为” + B2 =A2 & 成绩为 & B2 =A2 & “成绩为” & B2
)相向运动,a1:a2=1:4 ( )相背运动,a1:a2=2:1( )相向运动,a1:a2=2:1 ( )相背运动,a1:a2=4:1
当a1=a2时,只能相遇一次 若a1>a2时,可能相遇一次 若a1>a2时,不可能相遇两次 若a1<a2时,一定相遇
=AVERAGE(A2:H2) =SUM(A2:H2) =SUM(A2:H2)-MAX(A2:H2)-MIN(A2:H2) =(SUM(A2:H2)-MAX(A2:H2)-MIN(A2:H2))/(COUNT(A2:H2)-2)
)a1>a2 ( )a1=a2( )a1 ( )条件不足,无法判断
若a1>a2,可能相遇两次 若a1=a2,只能相遇一次 若a1若a1>a2,不可能相遇
count(A2、K2,“√”) count(A2,K2) countif(A2、K2,“√”) countif(“√”,A2、K2)
OOF、LOS LOF、OOF OOF、LOF LOF、LOS
若方阵A的行列式│A│=0,则A=0 若A2=0,则A=0 若A为对称阵,则A2也是对称阵 对任意的同阶方阵A、B有(A+(A-=A2-B2
若a1=a2,则两物体可能相遇一次 若a1>a2,则两物体可能相遇二次 若a1若a1>a2 ,则两物体也可能相遇一次或不相遇