Question

efectuează în doua moduri 5×(5+2) 8×(6-3) (2+4)×9 (5-3)×6 (3+2+4)×10 (5+1+2)×9 8×(7-3) 10×(4+3-2) ​

Answer 1

5•(5+2)=5•7=35
5•(5+2)=5•5+5•2=25+10=35

8•(6-3)=8•3=24
8•(6-3)=8•6-8•3=48-24=24

(2+4)•9=6•9=54
(2+4)•9=2•9+4•9=18+36=54

(5-3)•6=2•6=12
(5-3)•6=5•6-3•6=30-18=12

(3+2+4)•10=9•10=90
(3+2+4)•10=3•10+2•10+4•10=30+20+40=
=90

(5+1+2)•9=8•9=72
(5+1+2)•9=5•9+1•9+2•9=45+9+18=72

8•(7-3)=8•4=32
8•(7-3)=8•7-8•3=56-24=32

10•(4+3-2)=10•5=50
10•(4+3-2)=10•4+10•3-10•2=40+30-20=
=50