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我们爱清洁,所以衣服脏了要洗;我们要节约用水,所以希望用一定量的水把衣服尽量洗干净.这就提出了数学问题.而把现实问题化为纯数学问题就叫做建立数学模型.现在衣物已打好了肥皂,揉搓得很充分了.再拧一拧,当然不可能完全把水拧干.设衣服上还残留污水1斤,用20斤清水来漂洗,怎样才能漂
We love cleaning, so dirty clothes to wash; we want to save water, so I hope to use a certain amount of water to wash clothes as far as possible.This raises the mathematical problem.And the reality of the problem is called pure mathematical mathematical model Now that the clothes have been soaked in soap and rubbed very well, it is of course impossible to completely wring the water off with a screw, so that one kilogram of sewage remains on the clothes and rinse with 20 pounds of fresh water.