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b).- 11ax + 9cd - 4by
c).- 3ab + 5ac
d).- 48xy + 8xz
a=1 b= -1
5a2b3+√a2b2
5(1 )(-1)+ √1(-1)
5+1=6
-a(1+b)+4a3b4 - (2a2 - 3ab3)
-1(1-1)+4(1)(-1)-2(1)-3(1)(-1)
-1+1+4-2+3=5