Question

Solutia ecuatiei 12x+3=10×+7 este ??
2) perimetrul unui patrat=20cm aflati aria si diagonala
3)aflati Media aritmetica si media geometrica a nr 2si 8

Answer 1

1) 12x+3=10x+7 
12x-10x=-3+7
2x=4 | :2
x=2

2) P=20 cm 
P=4l => 4l=20 |:4 => l=5 cm
A= l^2 => 5^2=> 25 cm^2
d= l√2 => d= 5√2

3) Ma= $\frac{a+b}{2}$ = $\frac{8+2}{2}$ = $\frac{10}{2}$ =5

Mg = $\sqrt{a*b}$ = $\sqrt{8*2}$ = $\sqrt{16}$ = 4