Question

Exercițiul 12 și 13 va rog frumos

Answer 1

sper ca e ok! =))succes...

Answer 2

Răspuns:

12. a) 10×[36×3-5×(72-12×5)]=10×[108-5×(72-60)]=10×(108-5×12)=10×(108-60)=10×48=480

b) [27×5+4×(14×7-34)]×10=[135+4×(98-34)×10=(135+4×64)×10=(135+256)×10=391×10=3910

c)[44×5+9×(87-19×3)]×10=220+9×(87-57)]×10=(220+9×30)×10=(220+270)×10=490×10=4900

d) 10×[65×6-(35×4-40)×3]=10×[390-(140-40)×3=10×(390-100×3)=10×(290×3)=10×870=8700

13. a) {1+[25-3×(12×4-43)]×5}×4={1+[25-3×(48-43)]×5}×4=[1+(25-3×5)×5]×4=[1+(25-15)×5]×4=(1+10×5)×4=51×4=204

b) 6×{[(75-5×13)×5-43]×7+1}=6×{[(75-65)×5-43]×7+1}=6×[10×5-43)×7+1]=6×(7×7+1)=6×50=300