👤

1)Complectati spatile marcate si denumiti propietatile utilizate.
a)25+patratel=25
b)17+38=38+patratel
c)(12+35)+7=12+(35+patratel)
d)patratel+0=98
e)(a+11)+3=patratel+(3+a)

2)calculati folosind propietatile adunarii..
a)75+138+25
b)4+90+106
c)197+2457+3
d)23+78+27+22
e)11+12+13+14+15+16+17+18+19.
Multumesc...


Răspuns :

a)25+0 =0
b)17 + 38= 38  + 17
c)(12+35)+7= 12+ (35+7)
d)98+0= 98
e)(a +11)+3= 11+ (3+a)

2)
a)(75+25)+138 = 238
b)(4+90)+106 =   200
c)(197+3)+2457 =2657
d)(23+27)+(22+78) =150
e)(11+12+13)+(14+15+16)+(17+18+19)= 135