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a)\(\left(\frac{2}{3}+\frac{2}{5}\right)x=\frac{1}{5}-2\frac{1}{2}\)
\(\frac{16}{15}x=\frac{1}{5}-1\)
\(\frac{16}{15}x=-\frac{4}{5}\)
\(x=-\frac{4}{5}\div\frac{16}{15}\)
\(x=-\frac{3}{4}\)
b)\(\frac{4}{7}x-\frac{2}{3}=\frac{1}{5}\)
\(\frac{4}{7}x=\frac{1}{5}+\frac{2}{3}\)
\(\frac{4}{7}x=\frac{13}{15}\)
\(x=\frac{13}{15}\div\frac{4}{7}\)
\(x=\frac{91}{60}\)
\(\left(\frac{2}{3}+\frac{1}{5}\right)\)CHỨ HK PHẢI LÀ \(\left(\frac{2}{3}+\frac{2}{5}\right)\)ĐÂU Ạ
CHO MK XIN LỖI VÌ GHI SAI ĐẦU BÀI
\(=\)\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right)\times\left(\frac{4}{12}-\frac{3}{12}-\frac{1}{12}\right)\)
\(=\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right)\times0\)
\(=0\)
\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)
=\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{4}{12}-\frac{3}{12}-\frac{1}{12}\right)\)
=\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{1}{12}-\frac{1}{12}\right)\)
=\(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).0\)
=0
\(\left(\frac{1}{2}-\frac{3}{4}\right):\frac{1}{2}+\left(\frac{1}{2}\right)^2\)
\(=\left(\frac{2}{4}-\frac{3}{4}\right):\frac{1}{2}+\frac{1}{4}\)
\(=\frac{-1}{4}:\frac{1}{2}+\frac{1}{4}\)
\(=\frac{-1}{4}.\frac{2}{1}+\frac{1}{4}\)
\(=\frac{-1}{2}+\frac{1}{4}\)
\(=\frac{-2}{4}+\frac{1}{4}\)
\(=\frac{-1}{4}\)
a, \(x-\frac{5}{6}=\frac{-2}{3}\)
\(\Leftrightarrow x=\frac{1}{6}\)
b, \(\frac{-7}{5}+x=\frac{-4}{3}\)
\(\Leftrightarrow x=\frac{1}{15}\)
c, \(x-\frac{2}{5}=-\frac{1}{6}-\frac{3}{-4}\)
\(\Leftrightarrow x-\frac{2}{5}=-\frac{1}{6}+\frac{3}{4}\)
\(\Leftrightarrow x-\frac{2}{5}=\frac{7}{12}\Leftrightarrow x=\frac{59}{60}\)
a) 15x=-75
x=-75:15
x=-5
Vậy x=-5
b) 3|x|=18
|x|=18:3
|x|=6
=> x=6 hoặc x=-6
Vậy x=6 hoặc x=-6
c) -11|x|=-22
|x|=-22:(-11)
|x|=2
=>x=2 hoặc x=-2
Vậy x=2 hoặc x=-2
tk cho mk nha!
a/ \(\frac{x-1}{9}=\frac{8}{3}\)
\(\Leftrightarrow3\left(x-1\right)=72\)
\(\Leftrightarrow x-1=24\)
\(\Leftrightarrow x=25\)
Vậy ..
b/ \(\frac{-x}{4}=\frac{-9}{x}\)
\(\Leftrightarrow x^2=36\)
\(\Leftrightarrow x^2=6^2=\left(-6\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
Vậy ..
c/ \(\frac{x}{4}=\frac{18}{x+1}\)
\(\Leftrightarrow x\left(x+1\right)=72\)
\(\Leftrightarrow x\left(x+1\right)=8.9\)
\(\Leftrightarrow x=8\)
Vậy ..
Mk nhầm đây là toán 6 nhé!