Wykonamy obliczenia, dodając liczby w różnej kolejności.

a)

$\left(-15\right)+7+\left(-5\right)+3=\left(-20\right)+10=-20+10=-10$

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b)

$34+\left(-32\right)+\left(-18\right)+16=50+\left(-50\right)=50-50=0$

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c)

$-13+\left(-47\right)+\underline{19+\left(-19\right)}=-13+\left(-47\right)+\underline{0}=-13-47=-60$

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d)

$22+\underline{\left(-7\right)}+14+\left(-32\right)+\underline{7}=22+14+\left(-32\right)+\underline{0}=36+\left(-32\right)=36-32=4$

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e)

$\left(-7\right)+4+\left(-3\right)+13+\left(-10\right)=17+\left(-20\right)=17-20=-3$

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f)

$-16+9+\left(-7\right)+16+5+\left(-2\right)=30-25=5$