8m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=1

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8m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=18m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=18m²-5m(-m+3n)+4

8m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=1
8m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=1

8m²-5m(-m+3n)+4m(-4m-2分之5n)其中m=2n=1
8m²-5m(-m+3n)+4m(-4m-2分之5n)
=8m²+5m²-15mn-16m²-10mn
=-3m²-25mn
带入
=-3×4-25×2
=-12-50
=-62