(m+3+n-4)(m+3-n+4)=(m+n-1)(m-n+7)......................
1) 2 1/2 + 1 3/4 = 2 2/4 + 1 3/4 = 3 5/4 = 4 1/4
2) 6 2/3 + 4 4/5 = 6 10/15 + 4 12/15 = 10 22/15 = 11 7/15
3) 4 * 4 1/4 = 4 * 17/4 = 17
4) 11 7/15 : 2 = 172/15 * 1/2 = 86/15 = 5 11/15
5) 17 - 5 11/15 = 16 15/15 - 5 11/15 = 11 4/15
<span>3 в степени х-17=1/9
</span><span>3 в степени х-17=3^-2
x-17=-2
x=15
</span>
Cos x/4=1/2 ; x/4=-2pi/3 + 2pin ; x= 8pi/3+4pin