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\(\frac{3^7.16^3}{12^5.27^2}=\frac{3^7.\left(2^4\right)^3}{\left(2^2.3\right)^5.\left(3^3\right)^2}=\frac{3^7.2^{12}}{2^{10}.3^5.3^6}=\frac{3^7.2^{12}}{2^{10}.3^{11}}=\frac{2^2}{3^4}=\frac{4}{81}\)
\(\dfrac{3}{5}.\dfrac{6}{7}+\dfrac{3}{7}:\dfrac{5}{3}-\dfrac{2}{7}:1\dfrac{2}{3}.\)
\(=\dfrac{3}{5}.\dfrac{6}{7}+\dfrac{3}{7}.\dfrac{3}{5}-\dfrac{2}{7}.\dfrac{3}{5}.\)
\(=\dfrac{3}{5}\left(\dfrac{6}{7}+\dfrac{3}{7}-\dfrac{2}{7}\right).\)
\(=\dfrac{3}{5}.1=\dfrac{3}{5}.\)
Vậy.....
\(\dfrac{3^7.16^3}{12^5.27^2}=\dfrac{3^7.\left(2^4\right)^3}{\left(2^2.3\right)^5.\left(3^3\right)^2}.\)
\(=\dfrac{3^7.2^{12}}{\left(2^2\right)^5.3^5.3^6}=\dfrac{3^7.2^{12}}{2^{10}.3^{11}}.\)
\(=\dfrac{2^2}{3^4}=\dfrac{4}{81}.\)
Vậy.....
3^7. 16^3=3^7. (2^4)^3 =3^7.2^12 =3^2.2^2=2^2 =4
12^5.21^3=(3.2^2)^5.(7.3)^3=3^5.2^10.7^3.3^3=7^3.3^3=343.3=1029
= 314/273.42/65
sau đó bạn rút gon đi
314/273=314/39=35 và 42/65=1/486
ssau đó: nhân 2 số vs nhau=1/2 hehehehe
\(\frac{9^5.27^3}{3^{18}}=\frac{\left(3^2\right)^5.\left(3^3\right)^3}{3^{18}}=\frac{3^{10}.3^9}{3^{18}}=\frac{3^{19}}{3^{18}}=3^{19-18}=3^1=3\)
k mk nha !
\(\frac{9^5.27^3}{3^{18}}=\frac{\left(3^2\right)^5.\left(3^3\right)^3}{3^{18}}=\frac{3^{10}.3^9}{3^{18}}=3^{19-18}=3^1=3.\)
M = 54 - \(\frac{1}{2}\). \(\frac{2.3}{2}\)- \(\frac{1}{3}\). \(\frac{3.4}{2}\)- \(\frac{1}{4}\). \(\frac{4.5}{2}\)- ... - \(\frac{1}{12}\).\(\frac{12.13}{2}\)
= 54- \(\frac{3}{2}\)- \(\frac{4}{2}\)- \(\frac{5}{2}\)- ...- \(\frac{13}{2}\)
= 54 -\(\frac{1}{2}\). ( 1+2+3+4+5+6+...+12 -1-2)
= 54 \(\frac{1}{2}\). \(\frac{13.14}{2}-3\)
=54-\(\frac{1}{2}\)(91-3)
=54-\(\frac{1}{2}\).88
= 10
Vậy M = 10
( lưu ý : \(\frac{13.14}{2}-3\)ở trong ngoặc do k bt ghi kiểu j nên để đạm vậy )
\(=\frac{3^7\cdot\left(2^4\right)^3}{\left(2^2\cdot3\right)^5\cdot\left(3^3\right)^2}\)
\(=\frac{3^7\cdot2^{12}}{2^{10}\cdot3^5\cdot3^6}\)
\(=\frac{3^7\cdot2^{12}}{2^{10}\cdot3^{11}}\)
\(=\frac{2^2}{3^4}\)
\(=\frac{4}{81}\)