a.27x36+27x45-27

=27x(36+45-1)

=27x80

=2160

a. 720:[41-(2*x-5)]=120

41-(2*x-5)=720:120=6

2*x-5=41-6=35

2*x=35+5=40

x=40:2=20

Vậy x=20

b. (3,7:x-13)x0,2-1,4=10,8

 (3,7:x-13)x0,2=10,8+1,4=11,2

3,7:x-13=11,2:0,2=56

3,7:x=56+13=69

x=3,7:69=\(\frac{37}{690}\)