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Mathematics
7th Grade
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40 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Chọn hai đa thức P(x) và Q(x) sao cho P(x) + Q(x) = x2 + 1
A. P(x) = x2; Q(x) = x + 1
B. P(x) = x2 + x; Q(x) = x + 1
C. P(x) = x2; Q(x) = -x + 1
D. P(x) = x2 - x; Q(x) = x + 1
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Cho f(x) = x5 - 3x4 + x2 - 5 và g(x) = 2x4 + 7x3 - x2 + 6. Tìm hiệu f(x) - g(x) rồi sắp xếp kết quả theo lũy thừa tăng dần của biến ta được:
A. 11 + 2x2 + 7x3 - 5x4 + x5
B. -11 + 2x2 - 7x3 - 5x4 + x5
C. x5 - 5x4 - 7x3 + 2x2 - 11
D. x5 - 5x4 - 7x3 + 2x2 + 11
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Cho p(x) = 5x4 + 4x3 - 3x2 + 2x - 1 và q(x) = -x4 + 2x3 - 3x2 + 4x - 5. Tính p(x) + q(x) rồi tìm bậc của đa thức thu được
A. p(x) + q(x) = 6x3 - 6x2 + 6x - 6 có bậc là 6
B p(x) + q(x) = 4x4 + 6x3 - 6x2 + 6x + 6 có bậc là 4
C. p(x) + q(x) = 4x4 + 6x3 - 6x2 + 6x - 6 có bậc là 4
D. P(x) + q(x) = 4x4 + 6x3 + 6x - 6 có bậc là 4
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Tìm đa thức h(x) biết f(x) - h(x) = g(x) biết
f(x) = x2 + x + 1;
g(x) = 4 - 2x3 + x4 + 7x5
A. h(x) = -7x5 - x4 + 2x3 + x2 + x - 3
B. h(x) = 7x5 - x4 + 2x3 + x2 + x + 3
C. h(x) = -7x5 - x4 + 2x3 + x2 + x + 3
D. h(x) = 7x5 + x4 + 2x3 + x2 + x + 3
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Tìm hệ số cao nhất của đa thức k(x) biết f(x) + k(x) = g(x)
và f(x) = x4 - 4x2 + 6x3 + 2x - 1; g(x) = x + 3
A. -1
B. 1
C. 4
D. 6
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Cho 3 đa thức :
1. p(x)=x4−3x3+2x+5
2. q(x)=x3+2x2+5x4+x−9
3. h(x)=x4+5x3−7+4x2 + 6x
Tính p(x)+q(x)=?
A. 6x4+2x3+2x2+3x+4
B. 6x4−2x3+2x2+3x−4
C. 4x4−2x3−2x2−2x−4
D. 4x4+2x3−2x2+5x+13
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Cho 3 đa thức:
1. p(x)=x4−3x3+2x+5
2. q(x)=x3+2x2+5x4+x−9
3. h(x)=x4+5x3−7+4x2 + 6x
Tính q(x)+h(x).
A. 6x4+6x3+6x2+7x−16
B. 6x4−6x3+2x2−7x+16
C. 6x4+4x3+2x2+x−2
D. 6x3+6x4−6x2−16
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