Question

Opera. (SOLUCIONES: a= +8 b= +4 c= +9 d= -3 ) a) 8 + (4 – 9 + 7) · 2 + 4 · (3 – 8 + 4) =
b) 4 · [(+5) + (–7)] – (–3) · [7 – (+3)] =
c) (–3) · (+11) – [(–6) + (–8) – (–2)] · (+2) =
d) (–6) · [(–7) + (+3) – (7 + 6 – 14)] – (+7) · (+3) =

Answer 1

Respuesta:

a) 8 + (4 – 9 + 7) · 2 + 4 * (3 – 8 + 4) =

$=8+2\cdot \:2+4\left(3-8+4\right)\\=8+2\cdot \:2+4\left(-1\right)\\=8+4+4\left(-1\right)\\=8+4-4\\=8$

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b) 4 * [(+5) + (–7)] – (–3) * [7 – (+3)] =

$=4\left(-2\right)-\left(-3\right)\left[7-\left(3\right)\right]\\=4\left(-2\right)-\left(-3\right)\cdot \:4\\=-8-\left(-3\right)\cdot \:4\\=-8-\left(-12\right)\\=4$

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c) (–3) * (+11) – [(–6) + (–8) – (–2)] * (+2) =

$=\left(-3\right)\left(11\right)-\left(-12\right)\left(2\right)\\=-33-\left(-12\right)\left(2\right)\\=-33-\left(-24\right)\\=-9$

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d) (–6) * [(–7) + (+3) – (7 + 6 – 14)] – (+7) * (+3) =

$=\left(-6\right)\left(-3\right)-\left(7\right)\left(3\right)\\=18-\left(7\right)\left(3\right)\\=18-21\\=-3$

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