高二数学归纳证明```急````追分1)用数学归纳证明不等式:1+1/2+1/3+.+1/2的n次方-11),第二步证明从"K到K+1",左端增加的项是:2)用数学归纳法证明不等式:1X2+2X3+3X4+.+nX(n+1)=1/3n(n+1)(n+2) (n属于
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