1)1/2+1/3(13/4+5/6*1/8)=2)5/3*4/6+(8/6-5/3)=3)2/4-1/2(3/8+6/7*1/5=решите пожалуйста!!! 

1)1/2+1/3(13/4+5/6*1/8)=  5/6 * 1/8 =  5/48 13/4 + 5/48 =  156/48 + 5/48 = 161/48  1/3 * 161/48 = 161/44 1/2 + 161/144 = 72/144 +161/144 = 233/144 =  1  89/144 2)5/3*4/6+(8/6-5/3)= 8/6 -5/3 =  8/6 -10/6 = - 2/6 5/3 * 4/6 =  20/18 = 10/9 10/9 + ( - 2/6) = 20/18 -6/18 = 14/18 = 7/9 3)2/4-1/2(3/8+6/7*1/5=  решаю как если скобка после 1/5 6/7 * 1/5 =  6/35 3/8 +6/35 = 105/280 +48/280 = 153/280 1/2 * 153/280 = 153/560 2/4 - 153/560 =  280/560 -153/560 =  127/560