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.