有一根20m长的绳子,怎样用它围成一个面积为24m2的矩形?
人气:453 ℃ 时间:2020-01-27 15:34:32
解答
设矩形的长为xm,则宽为(20÷2-x)m,由题意得
x(20÷2-x)=24
x(10-x)=24
解得x1=4(不合题意舍去),x2=6,
所以矩形的长为6m,宽为10-6=4m.
答:可以围成一个长6米宽4米的矩形.
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