Question

1) Calculati: (-0,2)la puterea-1 •10la puterea -2 + 0,125:10 la puterea -1 -0,1(6)•3,6

Answer 1

-0,2= - 2/10= -1/5

(-1/5)⁻¹=  1/(1/5)¹= 1 * 5/1=5

10⁻²= 1/10²= 1/100

10⁻¹= 1/10

0,125=125/1000= 1/8

0,1(6)= (16-1)/90= 15/90=1/6

3,6= 3 intregi 6/10= 3 intregi 3/5= 18/5



5 * 1/100  + 1/8 :1/10  -1/6 * 18/5=

=1/20 + 1/8 * 10/1 - 3/5=

= 1/20 -5/4 -3/5      aducem la acelasi numitor

= (1-25-12)/20=  =(1-37)/20=  -36/20= -9/5