Question

Answer 1

SOS

SOS

SOS

SOS

 

Answer 2

a: =22/30+27/30-7/30=42/30=7/5

b: =50/210+-45/210+-24/210=-19/210

c =-1/3+1/4+1/12+1/6

=-1/3+3/12+2/12+1/12

=-1/3+1/2=1/6

Answer 3

a)11/15+9/10+(-7/30)

= 22/30+27/30+(-7/30)

=42/30

b)5/21+(-3/14)+(-4/35)

=350/1470-315/1470-168/1470

=-133/1470

c)-13/39+12/48+1/12+3/18

=-1/2+1/4+1/12+1/6

=-6/12+3/12+1/12+2/12

=0/12=0