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Let the profit made in 1998 be $y In 2003, profit is: y ( 1-10%)( 1-10%)( 1-10%)( 1-10%)( 1...

Let P people arrived in the cinema t minutes since 9:00... a people arrived in t minutes, the number...t) dt - 5t + 25 Therefore, let F(t) be the number of...

(a) let profit be x in 2010, {profit in 2011 :x(1-12%) profit in 2012 : x(1-12%)(1-12%) profit in 2013 : x(1-12%)^2 (1+10%) profit in 2014 : x(1-12%)^2 (1+10%)(1+10%) pforfit in 2015: x(1-12%)^2 (1+10%)(1+10%)(1+10%)= $5000000} {}內的內容可以不寫，你可直接...

let 's the mass of A and B be x and y respectively x+y=1800--(1) [120x/100+84y/100]=1800(100/100) (120x+84y)=180000--(2) 120(1800-y)+84y=180000 216000-120y+84y=180000 y=1000 gram so x=800 gram A has 800 gram,B has 1000 gram//

y= ln(x+√x) e^y = x+√x...(1) differentiate both sides with respect to x (e^y)(dy/dx) = 1 + 1/(2√x) (x+√x)(dy/dx) = 1+ 1/(2√x) by (1) dy/dx = (1+ 1/(2√x)) / (x+√x) 1/(dy/dx) = dx/dy = (x+√x) / (1+ 1/(2√x)) = 2(x^(3/2)+x) / (2√x + 1)

dx/dy or dy/dx??? dy/dx=(1+0.5x^-0.5)(x+x^0.5)^-1 dx/dy=(x+x^0.5)(1+0.5x^-0.5)^-1

... on consecutive contour lines. Let the difference in height between every two consecutive contour lines...helicopter is 36.72 m above the deck 5. Let the height of the lighthouse be x m Let the...

....jpg?t=1219996416 2008-08-29 23:20:14 補充： Alright, let me check, plx wait... 2008-08-29 23:30:27 補充： Sorry for ...