решите пример : 4 5/12 -1 1/2 : (2 1/5+8/15 ) * 1 4/5=

4 5/12-1 1/2:(2 1/6 + 8/15)* 1 4/5=53/12 - 3/2:(13/6 + 8/15)* 9/5 = 53/12 - 3/2:(65/30 + 16/30)*9/5 = 53/12 - 3/2:81/30*9/5 = 
= 53/12 - 3/2:81/30*9/5 =53/12 - 3/2*30/81*9/5 = 53/12 - 1 = 53/12 - 12/12 = 41/12 = 
= 3 5/12
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1) 2 1/5 +8/15=2 3+8/15=2 11/15
2) 1 1/2:2 11/15= 3/2*15/41=45/82
3) 45/82*1 4/5=45/82*9/5=81/82
4) 4 5/12-81/82=53/12-81/82=(4346-972)/984=3374/984=3 422/984= 3 211/492