12 3/5-7 1/6+2 3/10= 4/5:2 2/3+3 1/2= 170 8/51-2 4/9:3 2/3=

1) 12 3/5-7 1/6+2 3/10=63/5 - 43/6 +23/10 = 163/30+23/10 = 116/15 = 7 11/152) 4/5:2 2/3+3 1/2= 4/5 : 8/3 + 7/2 =4/5*3/8 + 7/2 =3/10 +7/2 = 19/5 = 3 4/53) 170 8/51-2 4/9:3 2/3=8678/51 - 23/9 : 11/3 =8678/51 - 23/9 * 3/11 =8678/51 - 23/33 = 31689/187 = 169 86/187