Question

320:(x-1)=(5³-5²):4+15

tìm x

Answer 1

=> 320 : (x - 1) = 100 : 4 + 15

=> 320 : (x - 1) = 25 + 15

=> 320 : (x - 1) = 40

=> x - 1 = 320 : 40

=> x - 1 = 8

=> x = 8 + 1

=> x = 9

Answer 2

Cái này dễ

320:(x-1)=(125-25):4+15

320:(x-1)=100:4+15

320:(x-1)=25+15

320:(x-1)=40

      x-1=320:40

        x-1=8

        x=8+1

    =>x=9

Answer 3

320:(x-1)= (125-100):4+15

320:(x-1)=100:4+15

320:(x-1)=25+15

320:(x-1)=40

x-1=320:40

x-1=8

x=8+1=9