Question

решите уравнение 5(х-2)-(х-1)=9

Answer 1

5(x-2)-(x-1)=9
5x-10-x+1=9
4x-9=9
4x=9+9
4x=18
x=18:4
x=4,5

Answer 2

5(х-2)-(х-1)=9
5х-10 -х+1=9
5х-х-10+1=9
4х-9=9
4х=9+9
4х=18
х=18:4
х=4,5      проверка      5(4,5-2)-(4,5-1)=5*2,5- 3,5=12,5-3,5=9
9=9