1) 3×(4-n)=3×4-3n=12-3n
8×( -6-m)=-48-8m
-3×(7-t)=-21+3t
2) a)7 (c-2)-10=7c-14-10=7c-24
b)10-8×(-3-n)=2×(-3-n)=-6-2n
c))-2 (n-4)+16 (t+2)=-2n+8+ 16 t+ 32=-2n+40+16t
d) 7×(5a)-8×(b+3)=35-7a-8b-24=11-7a-8b
3 ))-2/3 ×9/8=-6/8=-3/4
9/8×2/3= 9/12 =3/4
-3/2:21/26=-3/2×26/21 =13/7