问题
解答题
一个正方形的边长增加3cm,它的面积就增加39cm2,求这个正方形的边长.
答案
设边长为x,则(x+3)2=x2+39,
解得x=5cm.
答:正方形的边长是5cm.
一个正方形的边长增加3cm,它的面积就增加39cm2,求这个正方形的边长.
设边长为x,则(x+3)2=x2+39,
解得x=5cm.
答:正方形的边长是5cm.
补全对话(共5小题,每小题2分,共10分)从方框中选择最佳选项补全对话,有两项多余。
A: 小题2: ? B: My family went to the Great Wall. We visited my uncle in Beijing. A: 小题3: ? B: No, I stayed at home and studied for the math exam. 小题4: .Did you go? A: Yes, I did. I saw Lost in Thailand last night. B: 小题5: ? A: It was really exciting. |