A:-3
B:3
C:6
D:9
①1.4+0.6=____ 4.7-0.7=____ 1.4+2.6=____
②1.9-1.9=____ 3-2.7=____ 4.6+0.4=____
③2.8-1.8=____ 6.7-5.6=____