有一个牧场,已知3头牛在2个星期吃完2亩地上的草;2头牛在4个星期吃完2亩地上的草,问要有多少头牛才能在6个星期吃完6亩地上的草?假设牛未吃草时,草是一样高的,并且牧场里的草是不断生长的.这道有趣的关于牛吃草的问题是英国伟大的科学家牛顿提出来的,所以这一类问题又被称为牛顿问题.牛顿问题的难点在于牧场中的草是在不断生长的,牛吃的草,不仅包括草地上原有的草,还包括新长出来的草.这类问题可以通过设未知数,列方程来解 There is a pasture where 3 cows are known to have eaten 2 acres of grass in 2 weeks; 2 cows eat 2 acres of grass in 4 weeks and ask how many cows to eat in 6 weeks 6 The grass on the ground is assumed to be as tall as the grazing grass, and the grass in the grazing land is constantly growing. The interesting question about grazing cattle is raised by Newton, a great British scientist, One type of problem is also called Newton’s problem.The difficulty of Newton’s problem is that the grass in the pasture is constantly growing, and the cattle eat the grass, including not only the grass on the grass but also the newly grown grass, By setting unknown, column equation to solve