a)  -1/8 -2x/5-1/3=3

-2x/5=3+1/8+1/3

-2x/5=83/24

-2x=(83×5)/24=415/24

x = (415÷-2)/24= -415/48

b) -7/3 -(25/6 -4/3+ 3/2)

= -7/3 -13/3 = -20/3

ai ma co 10 k ban chac ban phai lap chuc nink thui

Câu b: Đặt  \(B=\left(\frac{1}{2}-1\right)\cdot\left(\frac{1}{3}-1\right)\cdot\left(\frac{1}{4}-1\right)\cdot...\cdot\left(\frac{1}{2004}-1\right)\)

Ta có:  \(\frac{1}{2}-1=\left(-\frac{1}{2}\right);\frac{1}{3}-1=\left(-\frac{2}{3}\right);...;\frac{1}{2004}-1=\left(-\frac{2003}{2004}\right)\)

\(\Rightarrow B=\left(-\frac{1}{2}\right)\cdot\left(-\frac{2}{3}\right)\cdot...\cdot\left(-\frac{2003}{2004}\right)\)

Vì B là 2003 thừa số âm nhân lại với nhau nên B là số âm

\(\Rightarrow B=-\left(\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot...\cdot\frac{2003}{2004}\right)=-\frac{1}{2004}\)

Câu a: Đặt  \(A=1+2^4+2^8;B=1+2+2^2+...+2^{11}\)

\(\Rightarrow16A=2^4+2^8+2^{12}\)   \(\Rightarrow15A=2^{12}-1\)   \(\Rightarrow A=\frac{2^{12}-1}{15}\)    \(\left(1\right)\)

\(\Rightarrow2B=2+2^2+2^3+...+2^{12}\)   \(\Rightarrow B=2^{12}-1\)   \(\left(2\right)\)

Từ  \(\left(1\right)\) và    \(\left(2\right)\)   \(\Rightarrow A:B=\frac{2^{12}-1}{15}:\left(2^{12}-1\right)=\frac{1}{15}\)

cau a dau nhi cuoi cung k phai j dau nha ! mk an lom ! 

\(a,\)\(\left|x+5\right|=\frac{1}{7}-\left|\frac{4}{3}-\frac{1}{6}\right|\)

 \(\Leftrightarrow\left|x+5\right|=\frac{1}{7}-\frac{7}{6}\)

\(\Leftrightarrow\left|x+5\right|=\frac{-43}{42}\)

ta có |x+5| \(\ge\)0 \(\forall x\)

Mà \(-\frac{43}{42}< 0\)nên ko có giá trị x thoả mãn

b,

 \(\left|x+\frac{2}{3}\right|=\frac{1}{2}-\left(\frac{1}{4}+\frac{2}{3}\right)\)

\(\Leftrightarrow\left|x+\frac{2}{3}\right|=\frac{11}{12}\)

\(\Leftrightarrow\orbr{\begin{cases}x+\frac{2}{3}=\frac{11}{12}\forall x\ge-\frac{2}{3}\\-x-\frac{2}{3}=\frac{11}{12}\forall< -\frac{2}{3}\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{4}\\x=-\frac{19}{12}\end{cases}}\)(thoả mãn đk)

chuvh7uuyj

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