Question

срочно !!!!!
1-а=130/300+90/300 помогите плиз 

Answer 1

1-а=130/300+90/300

1-а=210/300

1-а=7/10

а=1-7/10

а=3/10

Answer 2

спс)))

Answer 3

130+90 = 220...

Answer 4

1-а=220/300 1-а=22/300 а=1-22/30 а=1/3