a)20 + (-18) + (-16) + (-40)=.............................................................
(-65) + (+70)=...
(-4) + (-7) - (-5)=.........................................................................
12 - (-6) + (-20)=........................................................................
(-103) - (-12) - (-57)=................................................................
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20 + (-18) + (-16) + (-40)=20-18-16-40=-54
(-65) + (+70)=-65+70=5
(-4) + (-7) - (-5)=-4-7+5=-11+5=-6
12 - (-6) + (-20)=12+6-20=18-20=-2
(-103) - (-12) - (-57)=-103+12+57=-103+69=-34
bardzo łatwe
mam nadzieję że pomogłem;)