Bonjour!
a. 5.3 - 4.7=0.6
= -2.7 - 0.6 + 0.3
= -3
b. -7.6 + 5-(10.6-8)
= -7.6+5 - 2.6
= -5.2
c. -3 + 1.5 + 11 - 13 - (5 - 7.5)
= -3 + 1.5 + 11 - 13 + 2.5
= -1
d. 5 + 9 + 5 - 11
= 14 + 5 - 11
= 19 - 11
=8
e. -27.7
f. -13+3-6+1-6
= -10-6+1-6
= -16+1-6
= -15-6
=-21