2(10x−14)²−9(10x−14)+9=0пусть:(10х-14)=а2а²-9а+9=0D=(-(-9))²-4×2×9=81-72=9a1=(-(-9)-√9)/2×2=(9-3)/4=6/4=3/2=1,5a2=(-(-9)+√9)/2×2=(9+3)/4=12/4=310x1-14=a110x1-14=1,510x1=1,5+1410x1=15,5|÷10x1=1,5510x2-14=a210x2-14=310x2=3+1410x2=17|÷10x2=1,7Ответ: х1=1,55 и х2=1,7