1.16
а) 4,16+2,5+ 6,04 +3,5 = (4,16 + 6,04) + (2,5+3,5)= 10,2 +6=16,2
б) 7,3+1,6 -0,3-0,6 = (7,3-0,3) + (1,6-0,6)= 7+1=8
в)-1,06+0,04-7,04+2,16 = (2,16-1,06) + (-7,04+0,04) = 1,1-7=-5,9
г)18,9-6,8-5,2+4,1 = (18,9+4,1) + (-6,8-5,2) = 23-12=11
1.17
a)7.8 *6.3 + 7.8*13.7 = 7.8 * (6.3+13.7) = 7.8 * 20=156
б) 42.4 * 3/4 - 2.4 * 3/4 = 3/4 * (42.4 -2.4 ) = 3/4 * 40/1 =30