(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(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(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(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(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

原式=(1/4m^4--n^2)--4m^4+4m^2n--n^2+9/4m^2n+9/4n^2--25/4m^2n
=1/4m^4--n^2--4m^4--n^2+9/4n^2
=--15/4m^4+1/4n^2.
原式=(2m--n)^2--{(2/3m--1/2n)^2--6[(1/2m--n)+(1/2m+n)]...

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原式=(1/4m^4--n^2)--4m^4+4m^2n--n^2+9/4m^2n+9/4n^2--25/4m^2n
=1/4m^4--n^2--4m^4--n^2+9/4n^2
=--15/4m^4+1/4n^2.
原式=(2m--n)^2--{(2/3m--1/2n)^2--6[(1/2m--n)+(1/2m+n)][(1/2m--n)--(1/2m+n)]}--4/3m--(8/3m--7n)
=(2m--n)^2--{(2/3m--1/2n)^2--12mn}--4/3m--8/3m+7n
=4m^2--4mn+n^2--4/9m^2+2/3mn--1/4n^2+12mn--4mn+7n
=32/4m^2+14/3mn+1/4n^2+7n.

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