Risoluzione esercizi algebra

12xy^2-4xy^2 = 8xy^2

-5m^3n-10m^3n = -15m^3n

8c^2d^3-17c^2d^3 = -9c^2d^3

7abc+3abc = 10abc

8a^3x-5a^3x = 3a^3x

-9ab^2y+2ab^2y = -7ab^2y

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68a)

$\small 12xy^2+\left(-4xy^2\right) =$

$\small = 12xy^2-4xy^2=$

$\small = 8xy^2$

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68b)

$\small -5m^3n+\left(-10m^3n\right)=$

$\small = -5m^3n-10m^3n=$

$\small = -15m^3n$

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68c)

$\small  8c^2d^3-\left(+17c^2d^3\right)=$

$\small  = 8c^2d^3-17c^2d^3=$

$\small  = -9c^2d^3$

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69a)

$\small  7abc-\left(-3abc\right)=$

$\small  = 7abc+3abc=$

$\small  = 10abc$

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69b)

$\small  8a^3x+\left(-5a^3x\right) =$

$\small = 8a^3x-5a^3x =$

$\small = 3a^3x$

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69c)

$\small  -9ab^2y-\left(-2ab^2y\right) =$

$\small  = -9ab^2y+2ab^2y =$

$\small  = -7ab^2y$