3mn^2·1/2mn^2 +3/2m(mn)^2
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3mn^2·1/2mn^2+3/2m(mn)^23mn^2·1/2mn^2+3/2m(mn)^23mn^2·1/2mn^2+3/2m(mn)^2
3mn^2·1/2mn^2 +3/2m(mn)^2
3mn^2·1/2mn^2 +3/2m(mn)^2
3mn^2·1/2mn^2 +3/2m(mn)^2
3mn^2·1/2mn^2 +3/2m(mn)^2
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