Joint variation 2018-03-26.pdf - 1 100 30 18 100 1 1978 Q31...

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2018/3/26 網上問題紙 1/4 評語 : 1) 1978 Q31 If z varies as x and inversely as y, then (5 分數 ) A. xz y is a constant. B. yz x is a constant. C. z 2 xy is a constant. D. z 2 y x is a constant. E. xyz is a constant 解釋 : -- 參考資料 : -- 評語 : 2) 1989 Q09 If z varies inversely as x and directly as y, then (5 分數 ) A.xyz is a constant. B. xz/y is a constant. C.yz/x is a constant. D. xz 2 /y is a constant. E. z 2 /xy is a constant. 解釋 : -- 參考資料 : -- 評語 : 3) 1992 Q11 Suppose x varies directly as y 2 and inversely as z. Find the percentage increase of x when y is increased by 20% and z is decreased by 20%. (5 分數 ) A.15.2% B.20% C.50% D.72.8% E. 80% 解釋 : -- 參考資料 : -- 評語 : 4) 1997 Q39 Suppose x varies directly as y and inversely as z. When y = 2 and z = 3, x = 7. When y = 6 and z = 7, x = (5 分數 ) A.1. B.49/9. C. 9. D.49/4. E. 49. 解釋 : -- 參考資料 : -- 評語 : 5) 1998 Q17 If x varies inversely as y and directly as z 2 , then (5 分數 ) A. x yz 2 is a constant.
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