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MATH(Variation)
發問:
1.Assume g varies directly h2.When h=2,g=8.(a)Express g in terms of h.(b)Find the value of g when h=10. 2.Assume y varies directly x3.When x=3,y=54.(a)Express y in trems of x .(b) Find the value of y when x=4.3.Assume y varies directly √x where x>0.When x=9,y=45.(a)Express y in terms of x .(b)Find... 顯示更多 1.Assume g varies directly h2.When h=2,g=8. (a)Express g in terms of h. (b)Find the value of g when h=10. 2.Assume y varies directly x3.When x=3,y=54. (a)Express y in trems of x . (b) Find the value of y when x=4. 3.Assume y varies directly √x where x>0.When x=9,y=45. (a)Express y in terms of x . (b)Find the value of y when x=16.
最佳解答:
1a) Let g=kh2 when h=2, g=8 8=k(22) 8=4k k=2 ∴g=2h2 1b) when h=10 By (a), g=2(102) g=200 2a) Let y=kx3 when x=3, y=54 54=k(33) 54=9k k=6 ∴y=6x3 2b) when x=4 By (a), y=6(43) y=384 3a) Let y=k√x when x=9, y=45 45=k√9 45=3k k=15 ∴y=15√x 3b) when x=16 By(a), y=15(√16) y=60
其他解答:
教你做一題，其他你自己試試 1a) g=kh^2 Sub h=2 ,g =8 8=4k k=2 g=2h^2 b) sub h=10 g=200
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