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