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Olympic classical mathematics problems
1. Because the length is increased by 3CM, the volume is increased by 180cm3, indicating that lateral area is180/3 = 60cm2;

Similarly, the front area is 150/2=75 square centimeters; The bottom area is 160/4=40 square centimeters;

A cuboid * * * has six faces, in which the areas of two opposite faces are equal, and the surface area of the cuboid is:

=2 X (40+60+75)

=350 square centimeters

2。 Find the volume of this plasticine first: 363x2x55 = 3x11x11x5x3x5x1.

= 1 1^3X5^3X3^3

=( 1 1X5X3)^3

= 165^3

It can be seen that the side length of the cube is 165.

So the surface area of the cube is 165X 165X6.

= 163350 cm2