Primary school mathematics newspaper, grade six, unit 2, Su Jiao Edition answer. Urgent! ! !

1. Floor tile laying: 15× 12= 180 (m2)

Area to be painted:15× 4× 2+12× 4× 2+15×12-20 = 376 (square meter).

2.10×10× (6-3.2) =280 (cubic decimeter) = 280 (liter)

3. Area occupied by Babu: 10×0.4×8=32 (square meter).

Floor tile laying:10× 0.4× 7+10× 0.3× 8 = 52 (m2)

4. First of all, correct: "How can we maximize the surface area of the assembled rectangle? How to maximize the surface area of the assembled cuboid?

Maximum value:15× 3×1/kloc-0 /× 2+15× 3× 7× 2+11× 7× 2 =1774.

At least:15×1/kloc-0 /× 2+/kloc-0 /× 7× 3× 2+15× 7× 3× 2 =1422 (square centimeter).

5. "Square with four sides of 2 cm" should be "Cube with four sides of 2 cm" and "rectangular surface area" should be "cuboid surface area".