in order to calculate range, you need to get the difference between the max number and the min number
For this problem, you should use 7*20 directly, and then add the days between Saturday and Tuesday.
12*12=144
so, you should use 12+1 rather than 11+1
caution: this question needs the probability rather than the number
1000-9*9*9
every place has 9 options
change it into 1/r+1/s, and calculate directly
make a form
when taking 4 as the longest side, the limit is gained when a right angle appears
you should add the weight of chairs and the desks
the median is also feasible, because every choice is a number
you need to use 1/4*pi*r*r
use percentage, and present more rather than 1.31...
1+1/101=102/101
The answer to this question is x>=2 and x is even
use the approximate number to calculate
no repetition
you should consider one digit
for example the unit digit
222*(7+8+9)
1/x+1/y compare with 1
作比
36/(11*x*x)
This problem, you should know the 100 can always be divided by 4
image that are 2x balls at the beginning
4*3-2=10
not
use greedy strategy first, and then divide them
equation
at least, so two yellow balls are ok.
you need calculate possibility
4*60=240
but you still need to add 1
change the inequation, because the a,b here can be numbers other than integers
10200/2=5100
one half of the standard deviation 0.34
8=2*2*2
you should carefully write every number
get the common factor then calculate
答案 第一周当成1周后了
3 3 4
don't confuse yourself
we have no information about the distribution, so we cannot tell
caution: n and p <=30, so you should begin at a relatively large number
you should use the difference between the choice to help you calculate
