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khó........quá.........................mà....................... trời ....................... lại.................................rét.......................................tick ............ủng ................................hộ...................nha .............lạnh quá

x=23

linh tinh

Bài 1:   -154 + (x -9 - 18) = 40

            -154 + [x - (-27)] = 40

                        x - (-27) = 40 - (-154)

                        x - (-27) = 194

                                 x = 194 + (-27)

                                 x = 167

                          Vậy x = 167

Vì:\(x^{15}=x\)

⇒\(x=1\)

Thay b vào, ta có:\(B=\dfrac{3}{4}.\dfrac{6}{19}+\dfrac{4}{3}.\dfrac{6}{19}-\dfrac{1}{2}.\dfrac{6}{19}=\dfrac{1}{2}\)

Thay c vào, ta có:\(C=\dfrac{2002}{2003}.\dfrac{3}{4}+\dfrac{2002}{2003}.\dfrac{5}{6}-\dfrac{2002}{2003}.\dfrac{19}{12}=0\)

a)\(\dfrac{-6}{11}:\left(\dfrac{3}{5}.\dfrac{4}{11}\right)=\dfrac{-5}{2}\)

b)\(\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{14}{30}=\dfrac{67}{370}\)

c)\(\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)=-\dfrac{169}{50}\)

d)\(\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)=\dfrac{115}{103}\)

có 15 số đó! tick mk nha!