矩形的对角线为61厘米,宽度为11厘米。你怎么找到长度?
L = sqrt(3842或61.98386887 d = sqrt(L ^ 2 = W ^ 2 L = sqrt(d ^ 2 - W ^ 2 L = sqrt(61 ^ 2 - 11 ^ 2 L = sqrt(3721 - 121 L = sqrt) (3842#
矩形猪圈的周长为210Ft。长度比宽度大5英尺。你怎么找到长度?
长度= 55英尺设长度为L设宽度为W周长= 2W + 2L = 210 ............................... (1)但我们被告知L = W + 5“.........................(2)因此,我们需要找到长度我们需要'摆脱'W重新排列等式(2)我们给出:W = L-5代入等式(1)中的W给出“”2(L-5)+ 2L = 210 ....... ......................(1_a)将支架相乘“”2L-10 + 2L = 210向两侧加10“”2L + 0 + 2L = 220“”4L = 220将两边除以4“”L = 220/4 = 55