A:平均数为160
B:中位数为158
C:众数为158
D:方差为20.3
已知 1sinφ + 1cosφ =2 2 ,若φ∈(0, π2 ),则 ∫-1tanΦ(x2﹣2x)dx=( )
苏轼在《浣溪沙》中不自伤白发、不悲叹衰老的诗句是:____,____。
— Alice, could you help me ________ meat? I want to make some dumplings for dinner.
— OK. I'll do it right away.