Oblicz
5[0,4-\frac{2}{5}:(-2)]+cos60^0-5^2*\frac{1}{5}+7^0
źródło:
5[0,4-\frac{2}{5}:(-2)]+cos60^0-5^2*\frac{1}{5}+7^0=
=5[0,4+0,2]+0,5-5+1=5*0,6-5+1,5=3-3,5=-0,5