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一天早上,小刚的爷爷对小刚说:“我今天要用15米长的篱笆靠一面墙围成一个宽是3.5米的长方形鸡圈。你帮我算算,这个鸡圈的面积是多少?”小刚听了爷爷说的题目,在纸上画出下面的一幅图:“爷爷,你看我画的这幅图,它的宽是3.5米,从篱笆的全长15米里,减去宽的2倍,就是篱笆的长:15-3.5×2=8(米)。已知这个长方形的长是8米,宽是3.5米,就能求出这个长方形的面积:8×3.5=28(平方
One morning, Xiaogang's grandfather told Xiaogang: ”Today I am going to use a 15-meter-long fence to enclose a wall with a rectangular chicken ring 3.5 meters wide. You can calculate the area of this chicken ring is How much? “Xiaogang heard the grandfather said the topic, draw the following picture on the paper: ” Grandpa, you see this picture I draw, it is 3.5 meters wide, from the fence full length 15 The length of the fence is 15-3.5 × 2 = 8 (meters), minus the width of 2 times the width of the rectangle. The length of the rectangle is 8 meters long and 3.5 meters wide. The area of this rectangle can be found: 8 × 3.5 = 28 (squared