1.
<span>(-2,5+3/2/3):(-2/11/12)=(-25/10+11/3)
1.1.</span>
(-25/10+11/3)= <span>(-75+33)/30=-42/30=-7/5
1.2.(-7/5)*(-12/35)=12/25=0,48
2.</span>
(-1/1/3-3,5)×(-1/1/29)=(-4/3-35/10)·(-30/29)=(-4/3-7/2)·(-30/29)=
(-8-21)/6·)
(-30/29)=(29/6)·(30/29)=5
3.
<span>-2/2/3-х=1/1/9,(-8/3)-х=10/9, х=-8/3-10/9=-24-10/9=-34/9
х=-3 7/9( три целых семь девятых)</span>
=5(10x^3+5a^3)^4*30x^2=150x^2(10x^3+5a^3)^4
S=2400*25=60000=6га
60*20000=120000шт
Ответ 120000
1) х=1:2/7
х=1*7/2
х=7/2=3 1/2
2) х=1/9
3) х=1:1 5/8
х=1:13/8
х=1*8/13
х=8/13
4) х=1:7/15
х=1*15/7
х=15/7=2 1/7
5) х=1:1/2
х=1*2/1
х=2
6) х=1:3 2/5
х=1:17/5
х=1*5/17
х=5/17
7) х=1/100
8) х=1:2/3
х=1*3/2
х=1 1/2