Zad 13 str 30 . Klasa 6 podręcznik ..
Oblicz, starając się wykonać rachunki jak najsprytniej .
a) (-31) + (-15) + 18 + (-3) =
b) (-23) + (-36) + 40 + (-17)=
c) (-16) + 25 + 11 + (-20)=
d) (-64) + 45 + (-36) + 55=
e) (-52) + 47 + 15 + (-10)=
f) 142 + (-98) + 55 + (-99)=
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a) =-49+18 = -31
b) =-76 + 40= -36
c) = -36+36=0
d) = -100+100=0
e) = -62+62=0
f) = -197+197=0
a)-31
b)-36
c)0
d)0
e)-14
f)0