14. Найдите значения выражении a) c) ((21,85:43,7+8,5:3,4):4,5):1=+1 11; 21 m(13+2,5-1=) 123+3,4-2-0,35: b) 8 1 2 3,75+2 1 2 -1,875 2 2 3 2 +1,5 4 2,75-1 10 1 11 2 5 d) 7,4 3 5 7 11 0,5:1,25+:1 - (1,5+1):18 4 1 3 3​

Ответ:

a) ((21.85 : 43.7 + 8.5 : 3.4) : 4.5) : 1 = +1 1/11

1) 21.85 : 43.7 = 0.5

2) 8.5 : 3.4 = 2.5

3) 0.5 + 2.5 = 3

4) 3 : 4.5 = 3/4.5 = 1/1.5 = 2/3

5) 2/3 : 1 = 2/3 \* 1/1 = 2/3

6) 2/3 + 1 = 5/3 = 1 2/3

b) 8 1/2 - 3 7/8 + 1 23/28 - 1.875 - 2 1/32 + 1.5 4/11 - 2.75 + 10/111 = 123 - 3.

4 - 2 - 0.35 : 5

1) 123 - 3.4 - 2 = 117.6

2) -0.35 : 5 = -3.5/10 : 5/1 = -35/100 \* 1/5 = -7/100

3) 117.6 - 7/100 = 116.9

d) 7.4 3/5 - 7 11/0.5 : 1.25 + 1 - (1.5 + 1) : 18 \* 4 1/33 = 743/50 - 711/5 : 5/10 + 1 - 3/18 \* 131/33

1) 743/50 - 711/50 = 32/50