4. Deter termenul necunoscut X din:
a) x + 124=375
x=375-124=251
b) 537-x=254
x=537-254
x=303
5. Calculați.
a)15x27-14x3=405-42=363
b)207x105=21735
c)39x47=1833
7. Dati nr 2 factor comun :
a) 2a+2=2(a+1)
b) 2 •35+2•65=2(35+65)
c) 2+ 22z=2(1+11z)
d) 8m-2=2(4m-1)
e) 2+4+6+...+100=2(1+2+3+...+50)
8. Dati nr 3 factor comun :
a) 3y+3x =3(y+x)
b)3•41+3•59 =3(41+49)
c)3+3p=3(1+p)
d)12y-3=3(4y-1)
e)3+6+9+...+99=3(1+2+3+..33)
9. Dati factor comun a in urm ex:
a. ab+ac=a(b+c)
b. 7a+ab=a(7+b)
c. 18a+35a=a(18+35)
0. Calculați:
a. 3•9+8•9+10=27+72+10=109
b. 21•91+79•91 +100•91=1911+7189+9100=18200
c. 36•96+36•4+100•36=3456+144+3600=7200
d. 2015•2014+2015•1-2015•2015=405821+2015+4060225=8120450
6) 3x(5x4)=3x20=60 pachete biscuiti
Cu atat te-am putut ajuta.Sper ca ti-am fost de folos.Succes !