Question

Să se calculeze: a) 13-3. [7-2. (5-3)]; b) 9. {[8 + 7. (6 + 5)] -4 -3} + 2; c) 1 + {2+ [3 . (4+5) - 6+ 7.8] -9}​

Answer 1

13-3•[7-2•(5-3)]
13-3•(7-2•2)
13-3•(7-4)
13-3•3
13-9=4

9•{[8+7•(6+5)]•4-3}+2
9•([8+7•11)•4-3}+2
9•{(8+77)•4-3}+2
9•(85•4-3)+2
9•(340-3)+2
9•337+2
3033+2=3035

1+{2+[3•(4+5)-6+7•8]-9}
1+{2+(3•9-6+7•8)-9}
1+{2+(27-6+56)-9}
1+{2+(21+56)-9}
1+(2+77-9)
1+(79-9)=
1+70=71