Toán Lớp 6: Tìm x: a) [(2x-11):3+1].5=20 b)23^2=10.3^248.27^4 Mn giúp e vs ạ e cần gấp lắm:(

Question

Toán Lớp 6:  Tìm x: a) [(2x-11):3+1].5=20                   b)23^2=10.3^248.27^4 Mn giúp e vs ạ e cần gấp lắm:(

truongankimtrong · Answer

a)   [(2x-11):3+1].5=20   (2x-11):3+1=4   (2x-11):3=3   2x-11=1   2x=12   x=6   b)   23^2=10.3^248.27^4   23^2=10,27^4   529=5314410 :))???

cattien · Answer

T&igrave;m x:      a) [(2x-11):3+1].5=20            &rarr;     (    2    x    &minus;    11    )     :    3    +    1    =    20    :    5                   &rarr;     (    2    x    &minus;    11    )     :    3    +    1    =    4                   &rarr;     (    2    x    &minus;    11    )     :    3    =    4    &minus;    1                   &rarr;    2    x    &minus;    11    =    3    .    3                   &rarr;     (    2    x    &minus;    11    )     :    3    =    3                   &rarr;    2    x    &minus;    11    =    9                   &rarr;    2    x    =    9    +    11                   &rarr;    2    x    =    20                   &rarr;    x    =    20    :    2                   &rarr;    x    =    10            Vậy        x    =    10            b)2.3^2=10.3^248.27^4            &rarr;     (    2    x    &minus;    11    )     :    3    +    1    =    20    :    5                   &rarr;     (    2    x    &minus;    11    )     :    3    +    1    =    4                   &rarr;     (    2    x    &minus;    11    )     :    3    =    4    &minus;    1                   &rarr;     (    2    x    &minus;    11    )     :    3    =    3                   &rarr;    2    x    &minus;    11    =    3    .    3                   &rarr;    2    x    &minus;    11    =    9                   &rarr;    2    x    =    9    +    11                   &rarr;    2    x    =    20                   &rarr;    x    =    20    :    2                   &rarr;    x    =    10            Vậy        x    =    10  &larr;nghĩ vậy              @Flame Of Hope        @Lucky Rabbit