3 5 1 2 4
1 1/48 * 2 2/5 - (9 1/6 * 4/15 + 2 5/9) * 2/5 = 9/20 = 0,45
1) 9 1/6 * 4/15 = 55/6 * 4/15 = 11/3 * 2/3 = 22/9 = 2 4/9
2) 2 4/9 + 2 5/9 = 4 9/9 = 5
3) 1 1/48 * 2 2/5 = 49/48 * 12/5 = 49/4 * 1/5 = 49/20 = 2 9/20 = 2,45
4) 5 * 2/5 = 2
5) 2,45 - 2 = 0,45 = 9/20
На рисунке........................................................................................
8-28=z+17
z+17=8-28
z=8-28-17
z=-37
X-48:6=204
x-8=204
x=204+8
x=212
проверка
212-48:6=204
204=204
х:6=305-297
х:6= 8
х=8•6
х=48
проверка
48:6=305-297
8=8