1.已知x为整数,且2/(x+3)+2/(3-x)+2x+18/x²-9为整数,求所有符合条件的x的值2.解方程2(x²+1/x²)-3(x+1/x)-1=03.试证：对任意的正整数n,有1/1*2*3 + 1/2*3*4 + ...+1/n(n+1)(n+2)
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