(2x+1).2907=8721

=>2x+1=8721 : 2907

=>2x+1=3

=>2x=3-1

=>2x=2

=>x=1

Vậy x=1

a) (2x + 1) . 2907 = 8721

⇔2x+1=8721:2907

⇔2x+1=3

⇔2x=3−1

⇔2x=2

⇔x=1

 

(4x - 16) : 1905 = 60

⇔4x−16=60×1905

⇔4x−16=114300

⇔4x=114300+16

⇔4x=114316

⇔x=114316:4

⇔x=28579