12+4×(3z-4)-(5z+6) при z=3/4

Question

12+4×(3z-4)-(5z+6) при z=3/4

Answer 1

12+4x(3z-4)-(5z+6)=12+4x(3•3/4-4)-(5•3/4+6)=12+4x(9/4-4)-(3 2/4+6)=12+4x•9/4-4•4x-9 2/4=12+9x-16x-9 2/4=12-5x-9 2/4=2 2/4 -5x

2 2/4-5x
Чуть не сдохла