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(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²

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(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²(m²n+n²)-25/4m²n
-15m⁴+1/4n²
(2m-n)²-{(2/3m-1/2n)²-6[(1/2m-n)²-(1/2m+n)²]}-4/3m-(8/3m-7n)
3/4n²-6mn
(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²
(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²(m²n+n²)-25/4m²n
=1/4m⁴-n² -4m⁴+4m²n-n² -4m²n+9/4n²
=-15/4m⁴+1/4n²
(2m-n)²-{(2/3m-1/2n)²-6[(1/2m-n)²-(1/2m+n)²]}-4/3m*(8/3m-7n)
=4m²-4mn+n²-4/9m²+2/3mn-1/4n²-12mn-32/9m²+28/3mn
=3/4n²-6mn