—I'd like to know _______.
—At 6: 30.
A:when does your mother usually cook breakfast
B:how your mother usually cooks breakfast
C:when your mother usually cooks breakfast
D:how does your mother usually cook breakfast
下列命题中正确的个数是( )①x2>4是x3<-8的充分不必要条件。②在△ABC中,BC为最大边,则“AB2+AC2=BC2”是“△ABC为直角三角形的充要条件”。③若x2是无理数,则x也是无理数的逆命题.
计算
-2-3-8-1×-2-2×-12-2×π-3.140
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