б) y(y+9)=0
y=0 або y=-9
г) D= 1-4*7*(-8)= 1+224= 225; =15
1)z=
2)z== 16/7=
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б) y(y+9)=0
y=0 або y=-9
г) D= 1-4*7*(-8)= 1+224= 225; =15
1)z=
2)z== 16/7=