哪里看出来要乘以2

waizhongguo · 发表于 2006-9-18 11:29:00

waht is the combined area, in square inches, of the front and back of a rectangular sheet of paper measuring 8.5 inches by 11 inches.为什么答案是187？哪里看出来要乘以2？

iris555999 · 发表于 2006-9-18 11:31:00

combined area of front and back

[此贴子已经被作者于2006-9-18 11:32:02编辑过]

哪里看出来要乘以2

哪里看出来要乘以2

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