Question

A)4/5+2/3·9/4-3/10b)9/2·1/3-4/3+5/6
c)7/2-1/2:3/4-1/4

Answer 1

4/5+3/2-3/10=        aducem la acelasi numitor adica 10
8+15-3/10=20/10=2
b)  3/2-4/3+5/6=      aducem la acelasi numitor  care e 6
9-8+5/6=6/6=1
c)7/2-2/3-1/4=      aducem la acelasi numitor  care i 12
42-8-3/12=31/12
1/2:3/4=1/2*4/3=2/3       

Answer 2

A)4/5+2/3x9/4-3/10=4/5+18/12-3/10=24x4+18x10-3x12/120=
96+180+36/120=312/120=78/30=26/10=2.6
b)7/2-1/2x4/3-1/4=7/2-4/6-1/4=7x6-4x2-1x3/12=42-8-3/12=31/12=2,58