1. 0
2. 1
3. -4
4. -2
-2
1. 0
2. 3
3. 2
4. 1
1
1. the arthematic mean of a and b
2. the geometric mean of a and b
3. the harmonic mean of a and b
4. equal to zero
the harmonic mean of a and b
1. α=1, β=-1
2. α=1, β=±1
3. α=-1, β=±1
4. α=±1, β=1
α=±1, β=1
1. 1
2. 2
3. 3
4. 4
3
1. 1
2. 2
3. 0
4. -1
-1
1. 12
2. -94/7
3. 3/2
4. 5
-94/7
1. ±1/6{[a b c]-[a b d]+[a c d]-[b c d]}
2. {[a b c]-[a b d]+[a c d]-[b c d]}
3. ±1/6{[b c a]-[c b a]+[a c d]-[b c d]}
4. ±1/8{[b c a]-[a c d]+[a b d]-[b c d]}
±1/6{[a b c]-[a b d]+[a c d]-[b c d]}
1. 8d. (a+b+c)
2. d. (a+b+c)
3. 4d. (a+b+c)
4. none
8d. (a+b+c)
1. exactly one value of λ
2. no value of λ
3. exactly three values of λ
4. exactly two values of λ
no value of λ