45^2-43^2+44^2-42^2+43^2-41^2=
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(45²-43²)+(44²-42²)+(43²-41²)
[(45-43)(45+43)+(44-42)(44+42)+(43-41)(43+41)]
[(2)(88)+(2)(86)+(2)(84)]
2×2[(44)+(43)+(42)]
4[129]
516
[(45-43)(45+43)+(44-42)(44+42)+(43-41)(43+41)]
[(2)(88)+(2)(86)+(2)(84)]
2×2[(44)+(43)+(42)]
4[129]
516
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