let p and q be prime numbers that are the two distinct roots of the equation x^2-13x+R=0
where R is a real number. If b=p^2+q^2, find the value of b
已解
有條M.I唔識....
If prove that
1x2x2+2x3x4+....+n(n+1)(2n)=n(n+1)(n+2)(3n+1)
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6
evaluate the following expressions:
8x16x18+9x18x20+....+18x36x38
[ yhmjack1在2009-12-13 14:41重新編輯此帖 ]