1, "Shenzhou VIII" is an improved spacecraft, with a total length of 9 meters, a maximum diameter of 2.8 meters and a take-off mass of 8,082 kilograms. The simplest aspect ratio integer is (45: 14). It is known that the take-off mass of Tiangong-1 is about 8.5 tons, so when taking off, "Tiangong"

Chang 'e-1 is about (4 18) kg heavier than Shenzhou-8.

What can be simplified should be simplified:

24×( 18-4×3)÷3 (24/ 19+ 16/ 17)× 1/8+ 15/ 17

=48

Application questions:

1. Orchards sell apples in different grades, and the best apples are the first grade, with 3.6 yuan per kilogram; Followed by second class, the price per kilogram is 2.8 yuan; The last one is third class, and the price per kilogram is 2. 1 yuan. Now the mass ratio of three kinds of apples is 2: 3; 1。 If these three kinds of apples are sold together, how much do you think is appropriate per kilogram?

(3.6*2+2.8*3+2. 1)/6=2.95