#GRE数学每天一题#
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thethinrectangularsheetofmetalshowninthefigureis8incheswideandxincheslong.anopenboxistobemadebycuttinga2- inchsquarefrefreme actinge henfoldingupthesides.ifthevolumeoftheboxistobe 48 cubic inches,what is the value of x
A. 6
B. 8
C. 10
D. 12
E. 14
分析:
由答案c构成的长方体的底面的长度为( x-4 ),宽度为(8-4),高度为2体积为( x-4 ) ) (8-4) ) *2=48求解x=10