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[题目一]若一个长方体,长是宽的2倍,宽是高的2倍,所有棱长之和是56,则此长方体的体积是____。(第十一届小学“希望杯”全国数学邀请赛六年级第1试第16题)我是这样解的。此题包含和倍问题、长方体的特征及体积的计算等知识。把长方体的高看作1倍数,则宽为1×2=2,长为2×2=4。由长方体的特征可知,这个长方体长、宽、高之和是56÷4=14。这时,由和
[A] If a rectangular body, the length is 2 times the width, width is 2 times higher, the sum of all the prism length is 56, then the volume of the box is ____. (Eleventh primary “Hope Cup ” national mathematics invitational sixth grade first test 16 questions) I was so solution. This question contains and times the problem, the characteristics of cuboids and volume calculation and other knowledge. Taking the height of the cuboid as a multiple of 1, the width is 1 × 2 = 2 and the length is 2 × 2 = 4. According to the characteristics of the cuboid, the sum of the length, width and height of the cuboid is 56 ÷ 4 = 14. At this time, by and