Nhân đơn thức với đa thức

Câu 1

1đ

$\dfrac{5}{11}x^{4}.\dfrac{6}{5}x^2=$

\dfrac{6}{11}x^{2}

.

\dfrac{25}{66}x^{6}

.

\dfrac{6}{11}x^{8}

.

\dfrac{6}{11}x^{6}

.

Câu 2

1đ

$\dfrac{-4}{9}x^{7}.\dfrac{5}{4}x^5=$

\dfrac{5}{9}x^{12}

.

\dfrac{-16}{45}x^{12}

.

\dfrac{-5}{9}x^{12}

.

\dfrac{16}{45}x^{12}

.

Câu 3

1đ

$\left( \dfrac{-5}{11}x^{7} \right) .\left( \dfrac{-6}{5}x^5 \right)=$

\dfrac{6}{11}x^{12}

.

\dfrac{-25}{66}x^{12}

.

\dfrac{25}{66}x^{12}

.

\dfrac{-6}{11}x^{12}

.

Câu 4

1đ

$\dfrac{4}{5}x^{3}. \left (9x^{4}-6x-9 \right) =$

\dfrac{36}{5}x^{7}-\dfrac{24}{5}x^{4}-\dfrac{36}{5}

.

\dfrac{36}{5}x^{7}+\dfrac{24}{5}x^{4}+\dfrac{36}{5}x^{3}

.

\dfrac{36}{5}x^{7}-\dfrac{24}{5}x^{4}-\dfrac{36}{5}x^{3}

.

\dfrac{36}{5}x^{7}+\dfrac{24}{5}x^{4}+\dfrac{36}{5}

.

Câu 5

1đ

Thực hiện phép nhân: $x\left(6x^2-5x+1\right)=$

6x^3-5x^2+1

6x^3-5x^2+x

6x^3+5x^2+x

6x^3-5x^2-x

Câu 6

1đ

$-2x^{3}. \left (5x^{4}-10x-5 \right) =$

-10x^{7}-20x^{4}+10x^{3}

.

-10x^{7}-20x^{4}-10

.

-10x^{7}+20x^{4}+10x^{3}

.

-10x^{7}+20x^{4}+10

.

Câu 7

1đ

Thực hiện phép nhân: $-2\left(6x^2-5x+1\right)=$

-12x^2+10x+2

-12x^2-10x-2

-12x^2+10x-2

12x^2+10x-2

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