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四(2)班又要评选“数学智多星”了。牛老师出示了下面一幅图,对同学们说:“星期天,豆豆来到爷爷家,他想和爷爷一起到河边挑水,再到菜地里浇菜,然后回爷爷家。你认为他们按怎样的路线走最省力?请在图中画出来(假设爷爷家、河边和菜地间的路可以随意走)。”
Four (2) classes have to select “Mathematics Chi-Star” was. Niu teacher showed the following picture, to the students: “Sunday, Peas came to my grandfather’s house, he would like to go to the river with Grandpa to carry water, and then to the vegetable garden, and then back to my grandfather’s house. What do you think is the easiest way for them to go? Draw in the picture (assuming the grandfather’s house, the road between the riverside and the vegetable field are free to walk). ”