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  1. For all 4 questions, examine b^2-4ac for expression ax^2+bx+c if no real root or the exp always +ve/-ve => b^2-4ac&lt...

  2. ...) ‧ 文法結構(Structure & Written Expression ) ‧ 閱讀理解(Reading Comprehension) ‧ 寫作能力(Test...

  3. ...3c B,0.2c C.4.5c D.10 Because in an algebraic expression , terms with the same variable to the same power are called like...

  4. tan(540+X).sec(270+x).sin(90+x) = 360 2007-11-18 18:34:00 補充: X = 27.6 2007-11-18 21:11:08 補充: tan ( 540* x ) sec ( 270* x ) sin ( 90* x )= tan [ 360* ( 180* x ) ] sec [ 360* - ( 90* - x ) ] sin [ 180* - ( 90* - x ) ] = tan ( 180* x ) sec ( 90* - x ) sin ( 90* - x )= tan x csc x cos x = tan x cot x = 1

  5. ...as a case, we have  ╭  │x = 551/575 ─┤  │y = 1  ╰ In fact the general expression is  ╭  │x = (552t – t²)575 ─┤        , for all t ...

  6. (a+b)^2+2(a+b)+1 = (a+b)^2+2(a+b)(1)+1^2 = (a+b+1)^2

  7. ...not times 3. 2008-08-11 13:37:16 補充: Moreover, your expression in Q3 is strange though the same answer is reached: (5000...

  8. ...original knowledge falls they all well the person, does not resemble other logical expression they. To arrives, my good many thanks ascend the sky...

  9. ... = 10000[5√(x2 + 1600) + 3(60 - x)] Taking differentiation on the expression 5√(x2 + 1600) + 3(60 - x) with respect to x, we have: d[5√(x2 + 1600) + 3...

  10. ...astronaut Yang Liwei heroic bearing thrives, the facial expression is calm, marches into the present world the usable space biggest...