Question

determinati numarul natural x care verifica egalitatile    a)[(x+360:4)×5+700]:600=2 b) [3×(3x+7)+9]:16=3

Answer 1

A.[(x+360:4)·5+700]:600=2
(x+90)·5+700=2·600
(x+90)·5+700=1200
(x+90)·5=1200-700
(x+90)·5=500
x+90=500:5

X+90=100
X=100-90
X=10

B.
[3·(3x+7)+9]:16=3
3·(3x+7)+9=3·16
3·(3x+7)+9=48
3·(3x+7)=48-9
3·(3x+7)=39
3x+7=39:3

3x+7=13

3X=13-7
3X=6
X=6:3
X=2