Question

Rezultatul calculului : -0,8(3)+7supra 4 - 0,3(8)+0,375

Answer 1

0,8(3)=(83-8)/90=75/90=5/6
0,3(8)=(38-3)/90=35/90=7/18
0,375=375/1000=3/8
-0,8(3)+7/4 - 0,3(8)+0,375 =
=-5/6+7/4-7/18+3/8=
=(-5*12+7*18-7*4+3*9)/72=
=(-60+126-28+27)/72=
=65/72=0,902(7)