Question

Faceti mi ex 5 si7 de la pag 47 ( dau coroana )

Answer 1

Ex 5 | [(a-2)×3+26]:25=8 (a-2)×3+26=25×8 (a-2)×3+26=200 (a-2)×3=200-26 (a-2)×3=174 a-2=174:3 a-2=58=>a=58+2=>a=60. Ex5| 3+3×[3+3×(3+3×3)]=(3×a+3)×3+3 3+3×(3+3×12)=(3×a+3)×3+3 3+3×(3+36)=(3×a+3)×3+3 3+3×39=(3×a+3)×3+3 120=(3×a+3)×3+3 (3×a+3)×3=120-3 (3×a+3)×3=117 3×a+3=117:3 3×a+3=39=>3×a=39-3=>3×a=36=>a=36:3=>a=12 Ex:7| A:7=12 r <2 A=12×7 A=84+2 A=86 86:7=12r2 (nu este solutie) A=84+3 A=87=>A=87:7=>A=12 r.4 A=84+4 A=88=>A=88:7=>A=12 r.5 A=84+5 A=89=>A=89:7=>A=12 r.7 A=84+6 A=90=>A=90:7=>A=12 r.8 A=84+7 A=91=>A=91:7=>A=13 (nu este solutie) A={3;4;5;6} Coroniță?