1, 17 meters accounts for two-thirds of the total length, so we can get the whole 1 first.

17/(2/3)=5 1/2 (meters) is the total length, and then multiplied by the total length 1/3, the answer is 5 1/6.

2. Pricing is in 6 yuan. Supermarket A launched "buy five get one free" and bought five bottles. Actually, it is six bottles, and the average bottle is 30/6=5 (yuan).

Supermarket B is on sale, 1 minus 5, a bottle of 6-6 *( 1/5)= 4.8 yuan.

5 & gt4.8

So supermarket b is cheap.