在—幅长90cm,宽40cm的风景画的四周外围镶上一条宽度相同的金色纸边,制成一帽挂图如果要求风景画的面积是整个挂画面积
在—幅长90cm,宽40cm的风景画的四周外围镶上一条宽度相同的金色纸边,制成一帽挂图如果要求风景画的面积是整个挂画面积的72%，那么金色纸边的宽应该是多少?
共回答了17个问题
设宽为a厘米根据题意(90+2a)(40+2a)*72%=90*40(a+45)(a+20)=1250a²+65a-350=0(a+70)(a-5)=0a=5或a=-70舍去所以宽度=5厘米
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