помогите сделать уравнения:m-5/12m=1/4:0.75*3 5/9x+5/6x=1/4....срочно

помогите найти значение выражения:2,4*12,6*3,6/6,3*4,8*31,5

что означает 3, 6/6, 3?

1) m - 5/12m = 1/4 : 0,75 * 37/12m = 1/4 : 3/4 * 37/12m = 1/4 * 4/3 * 37/12m = 1*4*3 / 4*37/12m = 12/12m = 12/12 : 7/12m = 12/12 * 12/7m = 12*12 / 12*7m = 12/7m = 1 5/7проверка:12/7 - 5/12 * 12/7 = 1/4 : 0,75 * 312/7 - 5*12 / 12*7 = 1/4 : 3/4 * 312/7 - 60/84 = 1/4 * 4/3 * 312*12 / 7*12 - 60/84 = 1*4*3 / 4*3144/84 - 60/84 = 12/1284/84 = 12/121 = 12)5/9х + 5/6х = 1/45*2 / 9*2 * х + 5*3 / 6*3 * х = 1/410/18х + 15/18х = 1/425/18х = 1/4х = 1/4 : 25/18х = 1/4 * 18/25х = 1*18 / 4*25х = 18/100х = 9/50проверка:5/9 * 9/50 + 5/6 * 9/50 = 1/45*9 / 9*50 + 5*9 / 6*50 = 1/445/450 + 45/300 = 1/41/10 + 9/60 = 1/46/60 + 9/60 = 1/415/60 = 1/41/4 = 1/4