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Pufu128ask

a) (13 + 2) ⋅ 5 = 25 ⋅ 3;

b) 19 - (5 ⋅ 3 - 2) = 6;

c) (19 - 5) ⋅ (3 - 2) = 14.
a) 13+2•5=25•3
(13+2)•5=25•3
15•5=25•3
75=75

b) 19-5•3-2=6
19-(5•3-2)=6
19-(15-2)=6
19-13=6
6=6

c) 19-5•3-2=14
19-5•(3-2)=14
19-5•1=14
19-5=14
14=14

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