Question

Aflați numărul y din calculul următor:[(3•y+4)•2+5]•3+5=170​

Answer 1

Explicație pas cu pas:

[(3*y+4)*2+5]*3+5=170

(6*y+13)*3+5=170

18*y+39+5=170

18*y=170-44

18*y=126

y=126:18

y=7

Answer 2

$\it \[[(3\cdot y+4)\cdot2+5]\cdot3+5=170\Big|_{-5} \Rightarrow \[[(3\cdot y+4)\cdot2+5]\cdot3 =165|_{:3} \Rightarrow \\ \\ \Rightarrow (3\cdot y+4)\cdot2+5=55|_{-5} \Rightarrow (3\cdot y+4)\cdot2=50|_{:2} \Rightarrow 3\cdot y+4=25|_{-4} \Rightarrow \\ \\ \Rightarrow 3\cdot y=21|_{:3} \Rightarrow x=7$