1.

Fill in the blanks. (a) `(-8) +[-?][-?][-?][-?]=0 (b) 13+[-?][-?][-?][-?][-?] =0 (c) 12+(-12) (d) (-4)+=-1 (e) -15=-10`

Answer» a)8
b)-13
c)0
d)-8
e)5.


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