\(\dfrac{11}{15}\times\dfrac{1}{7}+\dfrac{11}{15}\times\dfrac{2}{7}+\dfrac{11}{15}\times\dfrac{4}{7}\)

\(=\dfrac{11}{15}\times\left(\dfrac{1}{7}+\dfrac{2}{7}+\dfrac{4}{7}\right)\)

\(=\dfrac{11}{15}\times1=\dfrac{11}{15}\)

=15/17 x (4/7 + 3/7) - 1/3
=15/17 x 1 - 1/3
=15/17 x (3/3 - 1/3)
=15/17 x 2/3
=30/51

7 x 5 + 15 = 35 + 15 = 50

7 x 9 + 17 = 63 + 17 = 80

=7x15 + 3x15 + 15x2 -30

=15x(7+3+2)-30

=15x12-30

=180-30

=50

2370

k cho tớ nhé

nhầm 150 nhé

Câu 30:

\(\dfrac{x+1}{8}=\dfrac{2}{x+1}\)

=>\(\left(x+1\right)^2=2\cdot8=16\)

=>\(\left[{}\begin{matrix}x+1=4\\x+1=-4\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right.\)

=>Chọn D

Câu 31:

\(-\dfrac{7}{15}\cdot\dfrac{5}{8}\cdot\dfrac{15}{-7}\cdot\left(-16\right)\)

\(=\dfrac{5}{8}\cdot\left(-16\right)=-10\)

=>Chọn D