\(0,5\times\dfrac{-2}{3}.\left(x+1\right)=\dfrac{-1}{12}\)

\(\dfrac{1}{2}\times\dfrac{-2}{3}.\left(x+1\right)=\dfrac{-1}{12}\)

\(\dfrac{-2}{3}.\left(x+1\right)=\dfrac{-1}{12}:\dfrac{1}{2}\)

\(\dfrac{-2}{3}.\left(x+1\right)=\dfrac{-1}{6}\)

\(x+1=\dfrac{-1}{6}:\dfrac{-2}{3}\)

\(x+1=\dfrac{1}{4}\)

\(x=\dfrac{1}{4}-1\)

\(x=\dfrac{-3}{4}\)

Vế 2 thiếu dấu " ( " bạn ơi.

rất bình thường em ạ

\(100-50:\left(x-4\right)=75\)

\(50:\left(x-4\right)=100-75\)

\(50:\left(x-4\right)=25\)

\(x-4=50:25\)

\(x-4=2\)

\(x=2+4\)

\(x=6\)

\(MSC\left(3;4;24\right)=24\)

⇒ \(\dfrac{1}{3}=\dfrac{1\times8}{3\times8}=\dfrac{8}{24}\)

\(\dfrac{1}{4}=\dfrac{1\times6}{4\times6}=\dfrac{6}{24}\)

\(\dfrac{1}{24}\) ( giữ nguyên phân số )

81000000000000 nhé

...20 . 70 ( đề bài ) nha anh POP.

Lần sau bạn nên để đúng môn học nhé!

\(7.2.5.35+10.25.7+20.70\)

\(=\left(7.2.5\right).35+\left(10.7\right).25+20.70\)

\(=70.35+70.25+20.70\)

\(=70.\left(35+25+20\right)\)

\(=70.80\)

\(=5600\)

\(B=1+7+7^2+7^3+...+7^{150}\)

\(7B=7.\left(1+7+7^2+7^3+...+7^{150}\right)\)

\(7B=7+7^2+7^3+7^4+...+7^{151}\)

\(7B-B=\left(7+7^2+7^3+7^4+...+7^{151}\right)-\left(1+7+7^2+7^3+...+7^{150}\right)\)

\(6B=\left(7^{151}-1\right)\)

\(B=\left(7^{151}-1\right):6\)