suanshu (8 14:17:54)A是8,B是4,AB的平方减B的平方除以2等于几?
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suanshu (8 14:17:54)A是8,B是4,AB的平方减B的平方除以2等于几?
suanshu (8 14:17:54)
A是8,B是4,AB的平方减B的平方除以2等于几?
suanshu (8 14:17:54)A是8,B是4,AB的平方减B的平方除以2等于几?
AB的平方减B的平方除以2
=B^2(A-1/2)
=4^2*(8-1/2)=120
504
AB^2-B^2/2
=B^2(A-1/2)
=16(8-1/2)
=120
(1024-16)/2=508