RΔspuns :
1. a) 2β2Β·3β3= 6β6.
b) -3β7Β·5β2= -15β14.
c) 2β6Β·4β3Β·(-1)= 8β18Β·(-1)=8Β·3β2Β·(-1)= -24β2.
d) β9Β·5Β·β4= 3Β·5Β·2=30.
e) 2,57Β·3,58Β·4,59Β·0= 0.
f) β5Β·(-β5)Β·(-2)= -β25Β·(-2)=10.
2. a) 2β3+3Β·4β3= 2β3+12β3= 14β3.
b) 5β2-2β2Β·2= 5β2-4β2= β2.
c) β6Β·(3β5-2β5)-β2Β·β15= β6Β·β5-β30= β30-β30= 0.
d) (4β2-β2)Β·β2+β2Β·β18= 3β2Β·β2+β36=3Β·2+6= 6+6= 12.
e) β3Β·(2β3+3β5)-β5Β·(β3+2β3)= 2Β·3+3β15-β5Β·3β3= 6+3β15-3β15= 6.
f) 2Β·(β12-β3)+(β27-β48)Β·3= 2Β·(2β3-β3)+(3β3-4β3)Β·3= 2Β·β3-β3= 2β3-β3= β3.
3. a= β5Β·(4β2-3β5)-2(β10+3)
a= 4β10-3Β·5-2β10-6
a= 2β10-21.
b = 2β7 Β· (3-β3) + 2 (4 + β21) - 6β7
b= 6β7-2β21+8+2β21-6β7
b= 8.
c = β12 Β· (β32 - 3β3) - 4 (7 + 2β6)
c= 2β3Β·(4β2-3β3)-28-8β6
c= 8β6-18-28-8β6
c= -46.
d = β48 Β· (β8 - β3) - 2β2 Β· (4β3 - β2)
d= 4β3Β·(2β2-β3)-8β6+4
d= 8β6-12-8β6+4
d= -8.
Sper ca te-am ajutat :)
b) -3β7Β·5β2= -15β14.
c) 2β6Β·4β3Β·(-1)= 8β18Β·(-1)=8Β·3β2Β·(-1)= -24β2.
d) β9Β·5Β·β4= 3Β·5Β·2=30.
e) 2,57Β·3,58Β·4,59Β·0= 0.
f) β5Β·(-β5)Β·(-2)= -β25Β·(-2)=10.
2. a) 2β3+3Β·4β3= 2β3+12β3= 14β3.
b) 5β2-2β2Β·2= 5β2-4β2= β2.
c) β6Β·(3β5-2β5)-β2Β·β15= β6Β·β5-β30= β30-β30= 0.
d) (4β2-β2)Β·β2+β2Β·β18= 3β2Β·β2+β36=3Β·2+6= 6+6= 12.
e) β3Β·(2β3+3β5)-β5Β·(β3+2β3)= 2Β·3+3β15-β5Β·3β3= 6+3β15-3β15= 6.
f) 2Β·(β12-β3)+(β27-β48)Β·3= 2Β·(2β3-β3)+(3β3-4β3)Β·3= 2Β·β3-β3= 2β3-β3= β3.
3. a= β5Β·(4β2-3β5)-2(β10+3)
a= 4β10-3Β·5-2β10-6
a= 2β10-21.
b = 2β7 Β· (3-β3) + 2 (4 + β21) - 6β7
b= 6β7-2β21+8+2β21-6β7
b= 8.
c = β12 Β· (β32 - 3β3) - 4 (7 + 2β6)
c= 2β3Β·(4β2-3β3)-28-8β6
c= 8β6-18-28-8β6
c= -46.
d = β48 Β· (β8 - β3) - 2β2 Β· (4β3 - β2)
d= 4β3Β·(2β2-β3)-8β6+4
d= 8β6-12-8β6+4
d= -8.
Sper ca te-am ajutat :)