Vлодки-x
V течения- y
{3(x+y)=90
{5(x-y)=90
{3x+3y=90|*5
{5x-5y=90|*3
+{15x+15y=450
+{15x-15y=270
30x=720:30
x=24
3(24+y)=90
72+3y=90
3y=90-72
3y=18:3
y=6
Y'(x) = - (x^(-6/5))/5 + (x^(-4/5)) / 5 + 1
y'(32) = - (32^(-6/5))/5 + (32^(-4/5)) / 5 + 1 = -1/(64*5) + 1/(16*5) + 1 = (-1+4+320)/320 = 323/320
2sin3acos2a-sin3a/2cos3acos2a-cos3a=sin3a(2cos2a-1)/cos3a(2cos2a-1)= sin3a/cos3a=tg3a
tg3a=tg3a
4(х-7)-8у=4у-44
8х=3(у-8)+55
4(х-7)-8у=4у-44
4((х-7)-2у)=4(у-11)
х-7-2у=у-11
х=у-11+7+2у
х=3у-4
8*(3у-4)=3(у-8)+55
24у-32=3у-24+55
24у-3у=31+32
21у=63
у=3
х=3*3-4
х=9-4
х=5