312-13+13=299+13=312
b)13×(55-45)=13×10=130
c)3+(362+10×(24+13))=3+(362+10×37)=3+(362+370)=3+732=735
d)5×(5+5×(5³-5²))+3×5²=
5+(5+5×100)+3×5²=
5+(5+500)+3×25=
5+550+75=
555+75=630
Explicație pas cu pas:
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