Four hundred and three babies are crying loudly. Do you know how to make them quiet in 41 seconds? There is an amazing new product on sale in Japan which does exactly this. It is an LP (a long-playing
Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants. Sometimes, the word “green” means young, fresh and growing.
设“a,b都是从区间［0,4］任取的一个数”为事件Ω,则μ(Ω)=4×4=16,
×3×3=
.由几何概型得P(A)=
=
=
.