提问XDF 蓝皮书上的内容 多谢相助

nightmere

If the number of square units in the area of circle C is twice the number of linear units in the circumference of C, what is the number of square units in the area?答案是16π无图我连中文意思都猜不出来






Of the science books in a certain supply room, 50 are on botany, 65 are on zoology, 90 are on physics. 50 are on geology, and 110 are on chemistry. If science books are removed randomly from the supply room, how many must be removed to ensure that 80 of the books removed are on the same science? 答案是324






150，200，250，n
Which of the following could be the median of the 4 integers listed above? I:175II:215III:235 答案是I 和II






What 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?答案是187无图






What fractional part of the total surface area of cube C is red?
1)Each of 3 faces of C is exactly 0.5 red
2)Each of 3 faces of C is entirely white.
答案是C