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∑ni=0i2=(n2+n)(2n+1)6
∑i=0ni2=ab
∑i=0ni2=(n2+n)(2n+1)6
∑j−0mj2+j3a+bc+d
αβωΓΔΩ
x2ilog2x
∑i=0∞i2
∏05i2
∫30
limx→0
∞
∂
111xyzx2y2z2
d(H1,H2)=∑i(H1(I)−H1¯)(H2(I)−H2¯)∑I(H1(I)−H1¯)2∑I(H2(I)−H2¯)2−−−−−−−−−−−−−−−−−−−−−−−−−−−−√