Cho a, b,c là ba số thực thỏa mãn a, b>0 và a+b+c=1. Chứng minh rằnga) (a+b)*(a+c)=a+bcb) √(a+b)(b+ca)/c+ab=a+b

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

Jasmine wants to eat at 8: 00pm her meal takes 65mins to cook what time does she need to put the meal in the oven

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4