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《九章算术》是中国传统数学最重要的著作,奠定了中国传统数学的基本框架.他的代数成就主要包括开方数、正负数和方程数.其中,方程数是九章算术最高的数学成就.《九章算术》中记载:“今有牛五,杨二,值金12,你娃儿养五只斤八两.问:牛羊各值金几何?”翻译文“假设有五头牛、两只羊,值金12;两头牛五只羊值金八两.因为每头牛每只羊各值金多少两?”

设每头牛之间x两类只羊值机外两可列方程组为《九章算术》是中国传统数学最重要的著作,奠定了中国传统数学的基本框架.它的代数成就主要包括开方术、正负术和方程术.其中,方程术是《九章算术》最高的数学成就.《九章算术》中记载:“今有牛五、羊二,值金十两;牛二、羊五,值金八两.问:牛、羊各值金几何?”译文:“假设有5头牛、2只羊,值金10两;2头牛、5只羊,值金8两.问:每头牛、每只羊各值金多少两?”设每头牛值金x两,每只羊值金y两,可列方程组为____.

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{5x+2y=102x<\

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    A girl complained to her father about her hard life. She didn't know what she had to do and wanted to1up. She felt tired of fighting and fighting. One problem had been finished but2came over.

    Her father, a cook, took her into the3.He poured water into three pans (锅) and boiled it. When the water was boiling, in the first pan he put some carrots, in the second he put some eggs and in the last he put some coffee. He 4for them for a few minutes without any words.

    The girl waited impatiently, not knowing5her father was doing that. About 20 minutes later, her father turned6the stove, took out the carrots and put them in a bowl. He took out the7and put them in another bowl. After that the coffee was poured into a cup. Turning back to his daughter, he asked, “My sweet heart, what do you8?” “Carrots, eggs and coffee,” she answered.

    Her father told her to 9her eyes and let her touch the carrots. She did so and felt that the carrots were10. After that he asked her to take eggs and11them. Then, she got the eggs, warm and hard. At last, the father asked her to smell the coffee. She asked, “What did you do this for, Father?” He12that each one had had the same unlucky experience—the boiling water, but13had a different result. The strong and hard carrots had become soft and weak after being in the boiling water. The eggs became hard after being cooked. The coffee was very14and it changed the water. “Who are you?” asked her father, “When bad luck15your door, what's your decision? Are you carrots, eggs or coffee?”