若a*b=a+ab,则6*(-5)=______.
根据题意,已知a*b=a+ab,
所以6*(-5)=6+6×(-5)=-24.
Is her birthday in September? [ ]
A. Yes, she is.
B. Yes, it is.
在图示的二极管电路中,设二极管D是理想的(正向电压的为0V,反向电流为0A),且电压表内阻为无限大,则电压表的读数为()
A.15V
B.3V
C.-18V
D.-15V