2m^2(-3m^2n+4m^3n^2)-(1/2m^2)^2(4n-mn^2)

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2m^2*(-3m^2n+4m^3n^2)-(1/2m^2)^2*(4n-mn^2)
2m^2*(-3m^2n+4m^3n^2)-(1/2m^2)^2*(4n-mn^2)

2m^2*(-3m^2n+4m^3n^2)-(1/2m^2)^2*(4n-mn^2)
原式=-6m^4n+8m^5n^2-(1/4m^4)(4n-mn^2)
=-6m^4n+8m^5n^2-m^4n+1/4m^5n^2
=-7m^4n+33/4m^5n^2

a(a-1)+(b-a²)=-7
a²-a+b-a²=-7
b-a=-7
(a²+b²)/2-ab
=(b²-2ab+a²)/2
=(b-a)²/2
=(-7)²/2
=49/2

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