b) \(-2\dfrac{2}{3}:x=1\dfrac{7}{9}:0.8\\ -\dfrac{8}{3}:x=\dfrac{16}{9}:\dfrac{4}{5}\\ -\dfrac{8}{3}:x=\dfrac{16}{9}.\dfrac{5}{4}\\ -\dfrac{8}{3}:x=\dfrac{20}{9}\\ x=-\dfrac{8}{3}:\dfrac{20}{9}\\ x=-\dfrac{8}{3}.\dfrac{9}{20}\\ x=-\dfrac{6}{5}\)
\(2\dfrac{2}{3}x+3\dfrac{3}{4}x=\dfrac{385}{24}\)
\(\dfrac{8}{3}x+\dfrac{15}{4}x=\dfrac{385}{24}\)
\(x\left(\dfrac{8}{3}+\dfrac{15}{4}\right)=\dfrac{385}{24}\)
\(x\left(\dfrac{32}{12}+\dfrac{45}{12}\right)=\dfrac{385}{24}\)
\(x\left(\dfrac{77}{12}\right)=\dfrac{385}{24}\)
\(x=\dfrac{385}{24}:\dfrac{77}{12}\)
\(x=\dfrac{385}{24}.\dfrac{12}{77}\)
<Bạn tự viết phép tính nha>
\(x=\dfrac{5}{2}\)
Vậy \(x=\dfrac{5}{2}\)
Chúc bn hk tốt!!
a) \(2\dfrac{2}{3}x+3\dfrac{3}{4}x=\dfrac{385}{24}\\ \dfrac{8}{3}x+\dfrac{15}{4}x=\dfrac{385}{24}\\ \left(\dfrac{8}{3}+\dfrac{15}{4}\right)x=\dfrac{385}{24}\\ \left(\dfrac{32}{12}+\dfrac{45}{12}\right)x=\dfrac{385}{24}\\ \dfrac{77}{12}x=\dfrac{385}{24}\\ x=\dfrac{385}{24}:\dfrac{77}{12}\\ x=\dfrac{385}{24}.\dfrac{12}{77}\\ x=\dfrac{5}{2}\)
\(a,2\dfrac{2}{3}x+3\dfrac{3}{4}x=\dfrac{385}{24}\)
\(x.\left(\dfrac{8}{3}+\dfrac{15}{4}\right)=\dfrac{385}{24}\)
\(x.\dfrac{77}{12}=\dfrac{385}{24}=>x=\dfrac{5}{2}\)
\(b,-2\dfrac{2}{3}:x=1\dfrac{7}{9}:0,8\)
\(\dfrac{-8}{3}:x=\dfrac{20}{9}=>x=\dfrac{-6}{5}\)
\(c,140\%+\dfrac{5}{3}x+2x=2280\)
\(\dfrac{7}{5}+x.\left(\dfrac{5}{3}+2\right)=2280\)
\(x.\dfrac{11}{3}=\dfrac{11393}{5}\)=>\(x=\dfrac{34179}{55}\)
\(d,-3\dfrac{1}{3}.\left|x\right|=1\dfrac{1}{2}-2\dfrac{2}{3}\)
\(\dfrac{-10}{3}.\left|x\right|=\dfrac{3}{2}-\dfrac{8}{3}\)
\(\dfrac{-10}{3}.\left|x\right|=\dfrac{-7}{6}\)
\(\left|x\right|=\dfrac{7}{20}=>x=\dfrac{7}{20};x=\dfrac{-7}{20}\)
Có chỗ nào sai thì thông cảm cho mình nha, chúc bạn học giỏi
