1) 1,5а + 9,7b+5,8а-1,3b = 7,3а + 8,4b
2) 12,75а+1,85b -9,55а+3,5b = 3,2а + 5,35b
2 3/10+(1,5-0,7)= 2,3+0,8 = 3,1
(12,4-9,35) + 2 12/25= 3,05+2,48 = 5,53
6 3/4- (2,35+0,23)= 6,75-2,58= 4,17
(27,61-8,1)+4 1/20= 19,51+4,04=23,55
3 2/5-(0,9+0,45)=3,4-1,35=2,05
(6,35-2,05)+9/10=4,3+0,9=5,2