Question

Scoateti factorul comun in afara parantezelor, apoi calculati:
a) 35*43+35*57; b) 24*37-24*32;
721*240+760*721; 692*453-433*692;

c) 4*35+4*52+4*13; d) 12*91-12*44-12*17;
9*15+15*6+6*15; 113*58-15*113-113*43;

e) 33*44+55*33-33*99;
27*51+51*34-60*51;

Answer 1

Scoateti factorul comun in afara parantezelor, apoi calculati:

a) 35*43+35*57;
=37(43+57)=43*100=4300
b) 24*37-24*32;
=24(37-32)=24*5=120

721*240+760*721;
=721(240+760)
=721*1000=721000

692*453-433*692;
=692(453-433)=692*20= 13840


c) 4*35+4*52+4*13;
=4(35+52+13)=4*100=400
d) 12*91-12*44-12*17;
=12(91-44-17)=12*30=360

9*15+15*6+6*15;
=15(9+6+15)=15*30=450

113*58-15*113-113*43;
=113(58-15-43)=113*0=0


e) 33*44+55*33-33*99;
=33(44+55-99)=33*0=0

27*51+51*34-60*51;
=51(27+51-60)=51*20=1020