(x-10)²=(1-x)²
x²-20x+100=1-2x+x²
-20x+2x=1-100
-18x=-99|:(-18)
x=5,5
Ответ:5,5.
2cos(x/3+π/4)-√3=0
cos(x/3+π/4)=√3/2
x/3+π/4=-π/6+2πk U x/3+π/4=π/6+2πk
x/3=-5π/12+2πk U x/3=-π/12+2πk
x=-5π/4+6πk U x=-π/4+6πk,k∈z
tg(-x/7)=-1
-tgx/7=-1
tgx/7=1
x/7=π/4+πk
x=7π/4+7πk,k∈z
Число 100 увеличить на 10% будет 110