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由於題目資料有限，我將會用試的方法求得答案。 考慮第一直行和第三直行都是３字頭的四位平方數，第一步是嘗試找出這兩個數的組合，令第三橫行和第四橫行的三位數為平方數。 （為方便起見，建議把３字頭的四位平方數和三位平方數（即５５平方至...

1.Y is not a real no. as all powers of 1=1 2.5^U=1 =5^0 U=0 3.Z is not a real no. as no. powers of any no.=0 5.f(x)=dividend(Q(x))+R whereQ(x) is the quotient & R is remainder if Q(x)=0,f(x...

...) sinC = 1 - cos 2C I hope this can help your understanding . =)

...10+ X = 10 + 19 = 29 G.ma = 62 + X = 62 + 19 = 81 2) not really understand the question, sorry.

... cannot reply you with the aid of a diagram, I hope you would understand my explanation. Let x be the length of the shadow, As the height...

cosX * sin70° - sinX * sin20° = 1.25 cos70°cosX * cos20° - sinX * sin20° = 1.25 cos70°cos (X + 20°) = 1.25 cos70°X + 20° = 2k(180°) ± arccos (1.25 cos70°) , where k is an integer.X = 360°k ± arccos (1.25 cos70°) - 20°X = 360°k...

鐵在水中生鏽, 是因為物質在水解情況下, 產生負電子, 使負電子跟鐵結合成為中性體, 使到水成為正電荷變作酸性, 而這些中性體就是鏽 ... 在水中加入可游離子增加生鏽, 是因為游離子的負電子比水的負電子更可以被鐵吸引結合成為中性體, 而且速度更快, ... 在雙結合(水結合+離子結合)而...

It is because you calculate the area using height X length. A circle can become these two thing ︵︵︵︵ .\/ \/ \/ \/ ./\ /\ /\ /\ ︶︶︶︶ these two thing can become - ︵︵︵︵ ＜---- piXr = length .\//\\//\\//\\//\...