2. Assuming that X people all agree, then (1/9)x people all disagree, and 40+37-x people only agree with one side.

So (1/9)x+(40+37-x)=45.

3、 13.8*3000*( 1-0.3%)- 10.56*3000*( 1+0.2%)

4、 140 * 6- 147- 145- 133- 140- 135 = 140cm

5. Let the lengths of three sides be x, y and z, then XY = 10, YZ = 6, XZ = 15.

Multiply by three formulas: x? y？ z？ = 10×6× 15=900

So the volume of a cuboid is xyz=30.

6、3/ 10+ 1/ 10+ 1/5+2/5= 1

So the side length of a big square is 1,

∵ 1/5÷ 1/ 10=2

The side lengths of the square with110 are 1/3, 3/ 10 respectively.

2/5÷3/ 10=4/3

Side length of 2/5 square: 4/7,7/10.

What is the shaded area: (4/7- 1/3)? =25/44 1

7. * * * * I saw him three times. The last time I saw him, Xiao Ming walked for 9.6 hours.