Xiaolan's room is 3.5 meters long, 3 meters wide and 3 meters high. Except for 4.5 square meters of doors and windows, wallpaper is pasted on all four walls of the room. Each roll of wallpaper is 6 square meters How many rolls of wallpaper do you need?

Xiaolan's room is 3.5 meters long, 3 meters wide and 3 meters high. Except for 4.5 square meters of doors and windows, wallpaper is pasted on all four walls of the room. Each roll of wallpaper is 6 square meters How many rolls of wallpaper do you need?

[(3.5*3*2)+(3*3)-4.5]/6

It is known that the height of the house is h meters. Now we need to paste wallpaper on the walls of the living room and bedroom. How many square meters of wallpaper do we need at least?
If the price of a wallpaper is B yuan / meter, how much does it cost to buy the wallpaper? (the area occupied by doors and windows is not deducted in the calculation)

(1) Living room + kitchen + bathroom area = 2x * 4Y + X * (4y-2y) + y * (4x-x-2x) = 8xy + 2XY + xy = (11xy) square meters answer: at least (11xy) square meters of floor tiles are needed. Floor area * floor tile unit price = 11xy * a = (11axy) yuan answer: at least (11axy) yuan is needed to buy floor tiles. (2) first calculate the bedroom and living room

The length of a classroom is 8 meters, the width is 6 meters, and the height is 4 meters. We need to paint the teacher's roof and four walls. Excluding the area of doors and windows, how many square meters is the painting area?
If 0.2kg of lime water is used, how many kg of lime water does the teacher need to paint this piece

Surrounding area = (8 + 6) * 2 * 4 = 112m2
Roof area = 6 * 8 = 48
Actual area = 112 + 48-22.4 = 137.6m2
Mass of lime water required = 137.6 * 0.2 = 27.52kg
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