Question

Calcula. Soluciones: a) –26; b) –8; c) –7; d) –9 a) 5 · (– 4) + 2 · (–3) = b) 20 : (–5) – 8 : (+2) = c) 2 · (–8) – 3 · (–7) – 4 · (+3) = d) 6 : (+2) + 5 · (–3) – 12 : (–4) =
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Answer 1

Respuesta:

a) 5 · (– 4) + 2 · (–3) =

$=-20+2\left(-3\right)\\=-20-6\\=-26$

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b) 20 : (–5) – 8 : (+2) =

$=-4-8\div \left(2\right)\\=-4-\frac{8}{\left(2\right)}\\=-8$

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c) 2 · (–8) – 3 · (–7) – 4 · (+3) =

$=-16-3\left(-7\right)-4\left(3\right)\\=-16-\left(-21\right)-4\left(3\right)\\-16-\left(-21\right)-12\\=-7$

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d) 6 : (+2) + 5 · (–3) – 12 : (–4) =

$=\frac{6}{\left(2\right)}+5\left(-3\right)-12\div \left(-4\right)\\\\=\frac{6}{\left(2\right)}-15-12\div \left(-4\right)\\\\=\frac{6}{\left(2\right)}-15-\left(-3\right)\\\\=-9$

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Answer 2

Respuesta:

4) =

Explicación paso a paso: