28 = 14 * 2
36 = 18 * 2
27 = 3 * 9
35 = 5 * 7
18 = 2 * 9
16 = 2 * 8
20 = 10 * 2
2 18/31 * а - 2,75 : b при a = 12,4; b = 4 5/7
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2 18/31 * 12,4 - 2,75 : 4 5/7 = 31 целая 5/12
1) 80/31 * 12,4 = 80 * 12,4 : 31 = 32
2) 2 3/4 : 33/7 = 11/4 * 7/33 = (1*7)/(4*3) = 7/12
3) 32 - 7/12 = 31 12/12 - 7/12 = 31 5/12
Пояснения:
2 целых 18/31 = (2*31+18)/31 = 80/31
2,75 = 2 целых 3/4 = (2*4+3)/4 = 11/4
4 целых 5/7 = (4*7+5)/7 = 33/7
<span>4a-(3b-c); => 4a-3b+c
-m-(2n+k); -m-2n-k
0,19+(4a-c); 0.19+4a-c
x+(8y-z); x+8y-z
m+(9n-k-p); m+9n-k-p
a-(4b+3c-d) a-4b-3c+d</span>