1.
a)28-5:4=
23:4=5,75
50:20•7=
2,5•7=17,5
b)36+21:7+15=
36+3+15=
39+15=54
64-35:5-32=
64-7-32=
57-32=25
c) (24-12:2•0)+(7•8-8•4)=
(24-6•0)+(56-8•4)=
(24-0)+(56-32)=
24+(56-32)=
24+24=48
(64:8+2):(36:6+4)=
(8+2):(6+4)=
10:(6+4)=
10:10=1
d) (24:4)+(10•5)+(100•0)=
6+(10•5)+(100•0)=
6+50+(100•0)=
6+50+0=
56+0=56
95-6•8+20=
95-48+20=
43+20=73
8•25+9•36=
200+9•36=
200+324=524
2.
3•6+3=
18+3=21
3•(6+3)=
3•9=27
10•5-2=
50-2=48
10•(5-2)
10•3=30
21:3+4=
7+4=11
21:(3+4)=
21:7=3
Noi observam ca o singură pereche de paranteze poate schimba totul .Adică toata ecuația sau tot calculul.
