Question

de la 6 la 11,va rog,repede

Answer 1

10) b) 84:(x-3)=12
x-3=84:12
x-3=7
x=7+3
x=10

c) 3•(4+5x)=72
4+5x=72:3
4+5x=24
x=20:5
x=4

Answer 2

Ex 8. Numerele sunt: 1533; 1566; 1599. Rezolvarea la ex 10. A) 2x+7=43+x=> 2x-x=43-7=>x=36 punctul b) 84:(x-3)=12=> notez (x-3)=t=>84:t=12=>t=84:12=>t=7 daca t=x-3 si tott=7=>7=x-3=>x=7+3=>x=10. Punctul c) 3( 4+5x)=72=>12+15x=72=>15x=72-12=>15x=60=>x=60:15=>x=4. La exercitul 11. A)9-2x=x+3=> -2x-x=3-9=>-x=-3=>x=3. La punctul b) 3(x+2)-1=x+7=> 3x+6-1=x+7=>3x+5=x+7=>3x-x=7-5=>2x=2=>x=2:2=>x=1. La punctul c) 4(2x+1)-(11-2*3)x=6=>8x+4-(11-6)x=6=>8x+4-5x=6=>8x-5x=6-4=>3x=2=>x=3:2=> x nu apartine lui N. Exercitiile 6;7 si 9 le ai pe foi