Question

rezolvati in Z ecuațiile ​

Answer 1

Răspuns:

a) 9(x-2)=-63 => 9x-18= -63 => 9x= -63+18=> 9x= -45 =>

x= -45/9 => x= -5

b) 5(x+3)=2(5x-5)=> 5x+15= 10x-10=> 5x-10x= -10-15=> -5x= -25=> -x= -25/-5=> -x= -5 => x=5

c) 2(4x+1)=2(5x-7) => (împărțim ambele părți ale ecuației la 2) => 4x+1=5x-7 => 4x-5x= -7-1=> -x= -8 => x=8

d) 2(-x+5)=-8(3x+2)+56= -2x+10= -24x-16+56=> -2x+10= -24x+40=> -2x+24x= 40-10=> 22x= 30=> x= 30/22=> x= 15/11

e) 1-4×[-5×(x-2)]=21=> -3×(-5x+10)=21=> 15x-30= 21=> 15x= 21+30=> 15x= 51=>

1+20x-40=21=> 20x= 21-1+40=> 20x= 20+40=> 20x= 60=> x= 60/20=> x= 3

f) 5(x-2)-7(x+3)+35=0=> 5x-10-7x-21+35=0=> -2x+4=0=> -2x= -4/÷(-2)=> 2x=4=> x=4/2=> x=2

Sper că te-am ajutat