摘要： A. That’s OK. B. My sister. C. I ’m sorry.
网址：http://m.1010jiajiao.com/timu3_id_737426[举报]
20、Assume that a，b，c，d are integers，and four equations （a-2b）x=1，（b-3c）y=1，（c-4d）z=1，w+100=d have always solutions x，y，z，w of positive numbers respectively，then the minimum of a is
（英汉词典：to assume假设；integer整数；equation方程；solutions （方程的）解；positive正的；respectively分别地；minimum最小值）!
查看习题详情和答案>>
2433
．（英汉词典：to assume假设；integer整数；equation方程；solutions （方程的）解；positive正的；respectively分别地；minimum最小值）!
Suppose that in Fig.2，the length of side of square ABCD is 1，E and F are mid-points of CD and AD respectively，GE and CF intersect at a point P．Then the length of line segment CP is
As shown in the diagram（如图），the triangle PQR has PR=14cm and PQ=10cm．The side RQ produced meets the perpendicular PS at S，so that QS=5cm．The perimeter（周长） of triangle PQR is30
30
cm．如图，在△PQR中，PR=14cm，PQ=10cm．过点P作PS⊥RQ交RQ的延长线于点S，QS=5cm，则△PQR的周长为
30
30
cm．