2 1/2 × (2/15- 3 5/6)-2 3/4
ЭТО ПЕРВЫЙ☝

- 1 1/7 ×(4/5+19/20)×(6 5/6+4 2/3
ЭТО ВТОРОЙ☝
(6 3/8-2 3/4)×(-4)+ 7/18×9
ЭТО ТРЕТИЙ ☝
9 1/6: (4 1/3-8)+24× 3/8
ЭТО ЧЕТВЕРТЫЙ☝

2 1/2 × (2/15- 3 5/6)-2 3/42/15-3 5/6= 2/15-23/6=4/30-115/30= -111/302 1/2×(-111/30)= -5/4×111/30= -111/24-111/24-2 3/4= -111/24-11/4= -111/24-66/24= -177/24= -7 9/24= - 7 3/8- 1 1/7 ×(4/5+19/20)×(6 5/6+4 2/3)4/5+19/20=16/20+19/20=35/20=7/46 5/6+4 2/3=10 (5/6+2/3)= 10(5/6+4/6)= 10(9/6)=10(3/2)=10+1 1/2=11 1/2=23/2-8/7×7/4×23/2= -23(6 3/8-2 3/4)×(-4)+ 7/18×96 3/8-2 3/4=4(3/8-6/8)= 4-3/8=3 5/8=29/829/8×(-4)= -29/27/18×9=7/2-29/2+7/2= -22/2= -119 1/6: (4 1/3-8)+24× 3/84 1/3-8= -3 2/3= - 11/39 1/6÷(-11/3)=55/6×(-3/11)= -5/224×3/8=9-5/2+9=9- 2 1/2= 6 1/2