2x-π/2=π/6+πn
2x=π/6+π/2+πn
2x=4π/6+πn
2x=2π/3+πn
x=π/3+πn/2
4) 2sin (π+3/4x-3π/2+3/4 x) /2 *cos ( π+3/4x+3π/2-3/4x)/2 =0
2sin( -π/2+6/4x) /2 * cos(5π/2)=0
sin(-π/2+6/4x)=0
-π/2+6/4x=πn
6/4x=π/2+πn
x=π/2*4/6 + 4πn/6
<span>x=π/3+ 2πn/3</span>
1228=1000+200+20+8
3650=3000+600+50
5027=5000+20+7
4008=4000+8
7302=7000+300+2
9600=9000+600
<span>10а2 - а - 3/12а2 - 4а - 5 = </span>10*1*2 - 1 -
3/12*1*2 – 4*1 - 5 = 20-1-0.5-4-5 = 9.5
5+6=11(шариков) всего. тут очень легко