2、(36/4)? ×36=29 16 cubic centimeter
3. Set the speed of vehicle A to 5x and the speed of vehicle B to 3x.
5x-3x=40
The solution is x=20.
The distance between ab is S=(5x+3x)×6=960km.
4. Let the total amount of money be X yuan.
A's money is x/3 yuan.
The monetary amount of B and C is 2x/3 yuan.
Let the sum of B's money be 5y and C's money be 3y.
5y-3y=300
The solution is y= 150 yuan.
5y+3y=2x/3
X= 1800 yuan
5.A× 20% = B× 1/4
A = B× 1/4 ÷ 20%
= B× 1.25
Therefore, the number A is 125% of the number B.
7、5/8×[ 1-(3/4+ 1/3)]
=5/8×[ 1-(9/ 12+4/ 12)]
=5/8×[ 12/ 12- 13/ 12]
=5/8×[- 1/ 12]
=-5/8× 1/ 12
=-5/96