Выносим за скобки и получаем
22/7*(25/6-13/4+2/3)=22/7*19/12=209/42
<span>(221 : 13 = 17)
</span>(17 : 17 = 1)<span>
221 = 13 · 17
</span><span>(1028 : 2 = 514)
</span><span>(514 : 2 = 257)
</span>(257 : 257 = 1)
1028 = 2 · 2 · 257
<span>(30498 : 2 = 15249)
</span><span>(15249 : 3 = 5083)
</span><span>(5083 : 13 = 391)
</span><span>(391 : 17 = 23)
</span><span>(23 : 23 = 1)</span>
30498 = 2 · 3 · 13 · 17 · 23
√3x-2=√2x+4
(√3x-2)²=(√2x+4)²
3x-2=2x+4
3x-2x=4+2
x=6
Cosx/(1+sinx)+sinx/cosx=(cos²x+sinx+sin²x)/cosx(1+sinx)=(1+sinx)/cosx(1+sinx)=
=1/cosx