Объяснение:
решение
1) 2x²-7x+6=0
D=b²-4ab= (-7)² - 4*2*6= 49 - 48=1
x1= -b+^D/2a= 7+1/2*2=8/4=2
x2= -b-^D/2a=7-1/2*2=6/4=3/2
2) 5x²-12x+4=0
D=b²-4ab= (-12)² - 4*5*4= 144-80=64
x1= -b+^D/2a= 12+^64/5*2= 12+8/10=20/10=2
x2 -b-^D/2a= 12-^64/5*2=12-8/10=4/10=2/5
