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c)2*7*3,5=14*3,5=49
d)3*100+(-27)=300+(-27)=273
f)72-(-510)=582
h)20-15/3=20-3=17
i)(-2,7-0,3)3*(-1)=(-3)3*(-1)=(-27)*(-1)=27
e)714-(-7)=721
g)(-10)+41=31
15/5= piętnaście piątych