Răspuns :
Răspuns:
aduci la acelasi numitor.amplifici cu 6 la prima cu 3 la a 2 a. vom avea: (42/18+15/18-1/8)-(16/18-9/18)=56/18-7/18=49/18
b)introducem sub radical,si vom avea
21/5+5/4-9/8)-(15/10-8/10)
(68/40+50/40-45/40)-7/10
(73/40)-7/10
73/40-28/40
45/40
Răspuns:
Explicație pas cu pas:
(7·6+3·5-1)/18-(8·2-9)/18=(42+15-1-72+9)/18=(66-73)/18=-7/18
(4+1-1+1/5+1/4-1/8)-(3·5-4·2)/10=[4+(8+10-5)/40]-7/10=4+13/8-7/10=
=4+1+5/8-7/10=5+(5·5-4·7)/40=5+(25-28)/40=5-3/40=4 si 37/40