8/23 *(3/4+1 1/6) 2 1/3 * 3/10:2 4/5 (4-2 1/2 *3/5): 3 1/3 9,72 :2,4

1) 8/23*(3/4 +7/6)= =8/23*(9+14)/12= =(8*23) /23*12 =8/12=2/3 2) 7/3 * 3/10 :14/5 = =21/30 :14/5 =21*5 /30*14= =3/6*2=3/12=1/4 при делении дробь переворачиваем и будет умножение, те 14/5=5/14 3) (4 -5/2*3/5) :10/3 = =(4-15/10)*3/10= (40-15)/10 * 3/10=25/10 *3/10 =25*3 /100=75/100=0.75 4) 9.72: 2.4= 972/100:24/10= =972/100 * 10/24 = =972*10 /100*24= =40.5 /10=4.05