2x-x=3
x=3
A: Zhou Yu lived to be 36 years old. (so pitiful. . )
2, 2. Wu Dalang sells cakes, Wu Dalang sells cakes all over the street, and sweet and salty boiled cakes sell fast; Sweet three, salty two, two, one, salty four, sweet two, two, two; Buy a sweet and salty cake each. How much is Wu Dalang cake?
Solution: If the biscuit is x cm, the salty biscuit is (2. 1-3x)/ 2.
[(2. 1-3x)/2]*4+2x=2.2
x=0.5
Therefore, x+(2. 1-3x)/ 2=0.8.
Answer: Buy a sweet and salty cake each, and Wu Dalang sells 0.8 yuan.
No, I'm too lazy to call. Please, don't answer the first two questions downstairs. I'm quite sure of my rights.
I want to work on paper. If no one has answered yet and you really need an answer, I will help you solve it when I have time. Come on!