A = \(\dfrac{5}{9}\cdot\left(\dfrac{1}{7}+\dfrac{1}{7}+\dfrac{3}{7}\right)\)

=\(\dfrac{5}{9}\cdot\dfrac{5}{7}=\dfrac{25}{63}\)

=(1/7+1/7+3/7).5/9

=5/7.5/9

=25/63

^{nhanh hộ mình cái}

\(\dfrac{\left(-0.25\right)^{-5}\cdot9^4\cdot\left(-2\right)^{-3}-2^{-2}\cdot6^9}{2^9\cdot3^6+6^6\cdot40}\)

\(=\dfrac{2^7\cdot3^8-2^8\cdot3^9}{2^9\cdot3^6+2^9\cdot3^6\cdot5}\)

\(=\dfrac{2^7\cdot3^8\cdot\left(-5\right)}{2^9\cdot3^6\cdot6}\)

\(=\dfrac{1}{4}\cdot9\cdot\dfrac{-5}{6}=\dfrac{-45}{24}=\dfrac{-15}{8}\)

\(\frac{3^8.5^9+15^8.3^2}{15^9.3^3-3^8.5^9}\)

\(=\frac{3^8.5^9+5^8.3^{10}}{5^9.3^{12}-3^8.5^9}\)

\(=\frac{3^8.5^8.\left(5+3^2\right)}{5^9.3^8.\left(3^4-1\right)}=\frac{14}{80}=\frac{7}{40}\)

\(=\frac{15^8.5+15^8.3^2}{15^8.5.3.3^3-15^8.5}\)

\(=\frac{15^8\left(5+9\right)}{15^8\left(5.3^4-5\right)}\)

\(=\frac{15^8.14}{15^8.400}\)

\(=\frac{14}{400}\)

\(=\frac{7}{200}\)

\(\frac{3^8\cdot5+15^8\cdot3^2}{15^9\cdot3^3-3^8\cdot5^9}\)

\(=\frac{3^8\cdot5^9+5^8\cdot3^9}{5^9\cdot3^3-3^8\cdot5^9}\)

\(=\frac{3^8\cdot5^8\left(5+3^2\right)}{5^9\cdot3^8\cdot\left(3^4-1\right)}\)

\(=\frac{14}{80}=\frac{7}{40}\)

a)c=1 000 000

9 . 3 + 9 . 7 

= 27 + 63

=  90 

9.3 + 9 . 7 = 9 ( 3 + 7) = 9 . 10 = 90

90 nha !

\(19\div\dfrac{2}{3}+43,5\times1\) 

\(=19\times\dfrac{3}{2}+43,5\)

\(=\dfrac{57}{2}+43,5\)

\(=28,5+43,5\)

\(=72\)

\(\dfrac{1}{2}+36,5\times150\%+1,5\)

\(=0,5+36,5\times1,5+1,5\)

\(=0,5+54,75+1,5\)

\(=55,25+1,5\)

\(=56,75\)

\(\frac{2^7\cdot3^4\cdot2^9\cdot3^5}{2^6\cdot3^3\cdot13}=\frac{2^{16}\cdot3^9}{2^6\cdot3^3\cdot13}=\frac{2^{10}\cdot3^6}{13}=\frac{746496}{13}\)

1 + 1 = 2

2 + 2 = 4

3 + 3 = 6

tk nha

1+1=2

2+2=4

3+3=6

k mk nha

1+1=2                                 2+2=4                                       3+3=6

= 6

kb nha

nhớ mk nhé

tk nha

=6 nha

1+2+3 =6. nhớ mình nhé! bắt đầu tính giờ. xem ai nhanh nhất nào