20 000кг= 20 тонн................................
0.2=5^-1
(-5)²a^6b^8*(-5)^-²a²b^4= (-5)^0a^8b^12=
1.
9/38+5/19=9/38+10/38=19/38=1/2
14/65+1/15=42/195+13/195=55/19539/11=3 6/11
2 4/21+1 9/14=2 8/42+1 27/42=3 35/42=3 5/6
2.
8 8/15 - 4 19/30=8 16/30 - 4 19/30=7 46/30 - 4 19/30=3 27/30=3 9/10
7 - 4 11/18=3 - 11/18=2 7/18
6 5/12 - 1 3/8=6 10/24 - 1 9/24=5 1/24
3.
х+(4 2/7 - 3 5/14)=3 1/6
х+4 4/14 - 3 5/14=3 1/6
х+13/14=3 1/6
х=3 1/6-13/14=3 7/42 - 39/42
х=2 10/42=2 5/21
4.
5.
..
31 - 9 16/45 - 5/9=31 - 9 16/45 - 25/45=21 4/45
Ответ:
(13-8 9/10)+(26 1/2-15 1/5)-(14 1/5-7)+(3 3/10+8 1/2)
Пошаговое объяснение:
13-8 9/10 = 4 1/10 = 4.1
26 1/2-15 1/5 = 11 3/10 = 11.3
14 1/5-7 = 7 1/5 = 7.2
3 3/10+8 1/2 = 11 4/5 = 11.8
4.1 + 11.3 - 7.2 + 11.8 = 20
5%=20
20:5*100=400
100%=400