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=7(5+(-4) - (-1))
=7(2) = 14
45(2b + 2) + t
=45(2*4+2) + (-2)
=45 (8+2) -2
=45 (10) - 2
= 450 - 2
=448
15 - 3xy - 1
=15 - 3*5*3 - 1
=15 - 45 - 1
=-31
7(5+ (-4) - (-1) )
45(2(4) + 2) + (-2)
15-3(5)(3)-1
y ahora resolver
7(5-4+1)=7(1+1)=7(2)=14
45(2(4)+2)-2=45(8+2)-2=45(10)-2= 450-2=448
15-3(5)(3)-1=15-(9)(5)-1=15-45-1=-30-1=-31
espero que te sirva ❤