Question

ex 6 și 7 vă rog frumos

Answer 1

6.a)

$5^4:5^2+5*(55^1-x:5)=5^3$

$5^2+5*(5*11-x:5)=5^3$

$5^2+5*5*11-5*x:5=5^3$

$5^2+5^2*11-x=5^3$

$5^2*(1+11)-x=5^3$

$5^2*12-x=5^3$

$5^2*12-5^3=x$

$5^2*(12-5)=x$

$5^2*7=x$

b)

$(5^4)^{14}:25^{12}-5*(55^1+x:5)=5^2$

$5^{56}:(5^2)^{12}-5*(5*11+x:5)=5^2$

$5^{56}:5^{24}-5*5*11-5*x:5=5^2$

$5^{32}-5^2*11-x=5^2$

$5^{32}-5^2*11-5^2=x$

$5^2(5^{30}-11-1)=x$

$5^2(5^{30}-12)=x$

7.

$x*2=a$

$a+10=b$

$b:5=10$

$b=10*5=50$

$a+10=50$

$a=50-10=40$

$x*2=40$

$x=40:2=20$