3.4т = 3400 кг (1т = 1000 кг)
3400+700=4100 кг
√3ctg(π/3-x)=-3
ctg(π/3-x)=-√3
tg(x+π/6)=-√3
x+π/6=-π/3
x=-π/3-π/6+πn,n∈z
x=-π/2+πn,n∈z
1)-8х=4
х=-1/2
2)10-2х-2-х=9
-3х=1
х=-1/3
<span>4n-m 3m+n 12mn-3m^2-12mn-4n^2 -3m^2-4n^2
--------- ---------= ---------------------------------- =------------------
20mn² - 15m²n 60m^2n^2 60m^2n^2
</span>
<span> 8 8+x^3-2x^2+2x^2-4x+4x-8 x^3
---- </span><span>+ x² + 2x + 4=------------------------------------------------</span>=--------
<span>x-2 x-2 x-2
</span>b+3 b-1 b+3 b-1 b^2+3b-9b+9 <span>(b-3)^2</span> b-3
------ ------- =-------------- - ---------------= ---------------------=----------------------=---------
9b-27 - b² - 3b 9(b-3) b(b-3) 9b(b-3) 9b(b-3) 9b
0,5х+6=8
0,5х=8-6
0,5х=2
х=2:0,5
х=4