\(\frac{37-x}{3}=\frac{x-13}{7}\)
Tính giá trị của các biểu thức sau bằng cách hợp lý nhất :
a)\(\left(4\frac{5}{37}-3\frac{4}{5}+8\frac{15}{29}\right)-\left(3\frac{5}{37}-6\frac{14}{29}\right)\)
b)\(60\frac{7}{13}x+50\frac{8}{13}x-11\frac{2}{13}x\)với \(x=-8\frac{7}{10}\)
bài 1 tính bằng cách hợp lí nếu có thể
\(\frac{-5}{12}\)-\(\frac{-3}{24}\)=
b) 5\(\frac{5}{13}\)-(1\(\frac{1}{2}+3\frac{5}{13}\))
c)\(\frac{-13}{37}.\frac{5}{23}+\frac{-13}{37}.\frac{18}{23}+\frac{50}{37}\)
d)(0,5 -\(\frac{3}{2}\)):1\(\frac{1}{6}+75\%\)
bài 2 tìm x biết
-7/5 +x = -3/4
-7/4 + 1/4 : x = 3/2
tìm x:
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\Leftrightarrow3.\left(x+13\right)=7.\left(37-x\right)\)
\(\Leftrightarrow3.x+13.3=7.37-7.x\)
\(\Leftrightarrow3x+39=-7x+259\)
\(\Leftrightarrow3x+7x=259-39\)
\(\Leftrightarrow10x=220\)
\(\Leftrightarrow x=22\)
37−xx+13=3737−xx+13=37
⇔3.(x+13)=7.(37−x)⇔3.(x+13)=7.(37−x)
⇔3.x+13.3=7.37−7.x⇔3.x+13.3=7.37−7.x
⇔3x+39=−7x+259⇔3x+39=−7x+259
⇔3x+7x=259−39⇔3x+7x=259−39
⇔10x=220⇔10x=220
⇔x=22
\(\frac{x-3}{7-5x}=\frac{1}{6}\)
b) \(\frac{37-x}{x+13}=\frac{3}{7}\)
c) \(\frac{4}{7}=\frac{7}{X^2}\)
\(\frac{4}{7}=\frac{7}{x^2}\)
\(\Leftrightarrow4x^2=7.7\)
\(\Leftrightarrow\left(2x\right)^2=49\)
\(\Leftrightarrow\orbr{\begin{cases}2x=7\\2x=-7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{2}\\x=-\frac{7}{2}\end{cases}}\)
Tìm x
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\frac{3x-y}{x+y}=\frac{3}{4}\)
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\Leftrightarrow\left(37-x\right).7=3.\left(x+13\right)\)
\(\Leftrightarrow259-7x=3x+39\)
\(\Leftrightarrow10x=220\)
\(\Leftrightarrow x=22\)
Vậy ...
Bài còn lại tương tự
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\frac{x+1}{3}=\frac{5}{x-1}\)
help me
a, <=> 7(37-x)=3(x+13)
<=> x =22
b, <=> (x+1)(x-1)=15
<=> x^2-1=15 <=> x^2=16 <=> x= +_4
tìm x:
\(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\Leftrightarrow7\left(37-x\right)=3\left(x+13\right)\Leftrightarrow259-7x=3x+39\Leftrightarrow259-39=3x+7x\)
\(10x=220\Leftrightarrow x=22\)
Tìm x
\(\frac{37-x}{x+13}=\frac{3}{7}\)
(37-x) . 7 =3. (x+13)
=>259 -7x=3x+39
=>.259-39=3x+7x
=>220=10x
=>x=22
Tìm x biết \(\frac{37-x}{x+13}=\frac{3}{7}\)
\(\frac{37-x}{x+13}=\frac{3}{7}\)
=> 3.(x+13)=7.(37-x)
=> 3x+39= 259-7x
=> 3x+7x=259-39
=> 10x= 220
=> x=22
\(\frac{a}{b}\) ai bày mk viết phân số với