khó quá làm sao mà trả lời đc

Vắt óc đi

tự đầu mình vắt óc mà suy nghĩ

\(\text{3 Giải}\)

\(\frac{x+1}{6}=\frac{8}{3}=\frac{16}{6}\Rightarrow x+1=16\Rightarrow x=15.\text{Vậy: x=15}\)

\(\Leftrightarrow\frac{\frac{x-3+5}{5}}{4}=\frac{\frac{4x-3}{6}}{6}\Leftrightarrow\frac{x+2}{20}=\frac{4x-3}{36}\Leftrightarrow36x+72=80x-60\Leftrightarrow44x=132\Rightarrow x=2\)

\(\Leftrightarrow\frac{\frac{10x+x+2}{2}}{9}-\frac{\frac{x+3+75}{5}}{12}=x-2\)\(\Leftrightarrow\frac{11x+2}{18}-\frac{x+78}{60}=x-2\)\(\Leftrightarrow\left(\frac{11}{18}-\frac{1}{60}-1\right)x+\left(\frac{2}{18}-\frac{78}{60}+2\right)=0\).Giải típ nha, ko có Casio nên mk ko bấm

\(\Leftrightarrow5x+\frac{x+2}{18}-x-\frac{x+3+75}{60}+2=0\Leftrightarrow\left(5+\frac{1}{18}-1-\frac{1}{60}\right)x+\left(\frac{2}{18}-\frac{78}{60}+2\right)=0\).Giải típ nha

giúp với ạ

giải dc nhưng mà hoi lâu

a)\(\dfrac{5}{7}+\dfrac{4}{9}=\dfrac{45}{63}+\dfrac{28}{63}=\dfrac{73}{63}\) ; \(\dfrac{9}{11}+\dfrac{3}{8}=\dfrac{72}{88}+\dfrac{33}{88}=\dfrac{105}{88}\)

\(\dfrac{4}{5}-\dfrac{2}{3}=\dfrac{12}{15}-\dfrac{10}{15}=\dfrac{2}{15}\); \(\dfrac{16}{25}-\dfrac{2}{5}=\dfrac{16}{25}-\dfrac{10}{25}=\dfrac{6}{25}\)

\(\frac{15}{41}+\frac{-138}{41}< x< \frac{1}{2}+\frac{1}{3}+\frac{1}{6}\)

\(\Leftrightarrow\frac{-123}{41}< x< \frac{1.3+1.2+1}{6}\)

\(\Leftrightarrow-3< x< 1\)

\(\Rightarrow x\in\left\{-2;-1;0\right\}\)

\(\frac{x}{5}=\frac{15}{2}-\frac{51}{10}\)

\(\frac{x}{5}=\frac{15.5-51}{10}\)

\(\frac{x}{5}=\frac{24}{10}\)

\(\frac{x}{5}=\frac{12}{5}\)

\(x=12\)

\(\frac{2x}{3}-\frac{1}{9}=\frac{59}{36}+\frac{1}{4}\)

\(\frac{2x}{3}-\frac{1}{9}=\frac{59+9}{36}\)

\(\frac{2x}{3}-\frac{1}{9}=\frac{68}{36}\)

\(\frac{2x}{3}=\frac{68}{36}+\frac{1}{9}\)

\(\frac{2x}{3}=\frac{68}{36}+\frac{4}{36}\)

\(\frac{2x}{3}=2\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=3\)

GIÚP MÌNH VỚI

Bạn nhân chéo lại nhé

A, 2.1.(-5)=1.4.x (bạn tự tính nhé)

B, x-1.16=15.2

C, x.x=20.5

=x mũ 2=100

x=5mũ 2

a) \(\frac{2,1}{x}=\frac{1,4}{-5}\)

\(\Rightarrow2,1.\left(-5\right)=x.1,4\)

\(\Rightarrow-10,5=x.1,4\)

\(\Rightarrow x=\left(-10,5\right):1,4\)

\(\Rightarrow x=-7,5\)

Vậy \(x=-7,5.\)

b) \(\frac{2}{x-1}=\frac{16}{15}\)

\(\Rightarrow2.15=\left(x-1\right).16\)

\(\Rightarrow30=16x-16\)

\(\Rightarrow16x=30+16\)

\(\Rightarrow16x=46\)

\(\Rightarrow x=46:16\)

\(\Rightarrow x=\frac{23}{8}\)

Vậy \(x=\frac{23}{8}.\)

c) \(\frac{20}{x}=\frac{x}{5}\)

\(\Rightarrow20.5=x.x\)

\(\Rightarrow100=x^2\)

\(\Rightarrow x^2=100\)

\(\Rightarrow\left[{}\begin{matrix}x=10\\x=-10\end{matrix}\right.\)

Vậy \(x\in\left\{10;-10\right\}.\)

Chúc bạn học tốt!

\(a.\)\(\frac{13x-16}{15}+\frac{x-32}{35}< \frac{x-6}{21}\)\(MC:105\)

\(\Leftrightarrow\frac{7\left(13x-16\right)}{105}+\frac{3\left(x-2\right)}{105}< \frac{5\left(x-6\right)}{105}\)

\(\text{Khử mẫu ta dc pt tương đương vs pt:}\)

\(\Leftrightarrow7\left(13x-16\right)+3\left(x-2\right)< 5\left(x-6\right)\)

\(\Leftrightarrow91x-112+3x-6< 5x-30\)

\(\Leftrightarrow94x-118< 5x-30\)

\(\Leftrightarrow94x-5x< 118-30\)

\(\Leftrightarrow89x< 88\)

\(\Leftrightarrow x< \frac{88}{89}\)

.\(b.\)\(\frac{5x+12}{14}+\frac{11x+28}{3}>\frac{4x+9}{17}\)\(MC:714\)

\(\text{Khi khử mẫu pt ta dc pt tương đương}:\):

\(\Leftrightarrow51\left(5x+12\right)+238\left(11x+28\right)>42\left(4x+9\right)\)

\(\Leftrightarrow255x+612+2618x+6664>168x+378\)

\(\Leftrightarrow2873x+7276>168x+378\)

\(\Leftrightarrow2873x-168x>-7276+378\)

\(\Leftrightarrow2705x>-6898\)

\(\Leftrightarrow x>-\frac{6898}{2705}\)