1. 1≤d≤9
2. 2≤d≤8
3. 1≤d≤5
4. 3≤d≤6
1≤d≤9
1. 19π/2
2. 209/41
3. 209/14
4. 19/4
209/14
1. c(a-b)/a2
2. b/c
3. 3abc-b3/a3
4. c/a
c(a-b)/a2
1. -2
2. 2
3. -4
4. -1/2
-2
1. a+b=0
2. b+c=0
3. b=c
4. a=b
b=c
1. c=0
2. c=0,b≠0
3. b=0,c=0
4. b=0,c≠0
c=0,b≠0
1. ax2+x(4a-b)+4a-2b+c=0
2. ax2+x(4a-b)+4a+2b+c=0
3. ax2+x(b-4a)+4a+2b+c=0
4. ax2+x(b-4a)+4a-2b+c=0
ax2+x(b-4a)+4a-2b+c=0
1. Positive
2. Negative
3. Non negative
4. can not be determined
can not be determined
1. 6
2. -6
3. 12
4. -12
6
1. -1
2. -2
3. -3
4. -10
-3