Bài làm

   1.2.3...9 - 1.2.3...8 - 1.2.3...7.8²

= 1.2.3...8.( 9 - 1 - 8 )

= 1.2.3...8 .0

= 0

_Chúc_Bạn_Hok_Tốt_^^

\(1.2.3....9-1.2.3...8-1.2.3...7.8^2=1.2.3....8\left(9-1-8\right)=1.2.3....8.0=0\)

=1.2.3.4.5.6.7.8 .(9-1-8)

1.2.3.4.5.6.7.8.0=0

Ủng hộ mk nha

a: \(\dfrac{10^2+11^2+12^2}{13^2+14^2}=\dfrac{100+121+144}{169+196}=\dfrac{365}{365}=1\)

c: \(=\dfrac{3^2\cdot2^{36}}{11\cdot2^{13}\cdot2^{22}-2^{36}}=\dfrac{3^2\cdot2^{36}}{2^{35}\cdot\left(11-2\right)}=2\)

a: \(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)

\(=\frac{100+121+144}{169+196}=\frac{365}{365}=1\)

b: \(1\cdot2\cdot3\cdot\ldots\cdot9-1\cdot2\cdot3\cdot\ldots\cdot8-1\cdot2\cdot3\cdot\ldots\cdot7\cdot8^2\)

\(=1\cdot2\cdot3\cdot\ldots\cdot8\cdot\left(9-1-8\right)\)

=0

c: \(\frac{\left(3\cdot4\cdot2^{16}\right)^2}{11\cdot2^{13}\cdot4^{11}-16^9}=\frac{\left(3\cdot2^{18}\right)^2}{11\cdot2^{13}\cdot2^{22}-2^{36}}=\frac{3^2\cdot2^{36}}{2^{35}\cdot\left(11-2\right)}=2\)

d: 1152-(374+1152)+(-65+374)

=1152-374-1152-65+374

=-65

\(b)\) \(1.2.3...9-1.2.3...8-1.2.3...8^2\)

\(=\)\(1.2.3...8\left(9-1-8\right)\)

\(=\)\(1.2.3...8\left(9-9\right)\)

\(=\)\(1.2.3...8.0\)

\(=\)\(0\)

1.2.3.......9-1.2.3...8-1.2.3....8²

=1.2.3.......9-1.2.3.........8-1.2.3....8.8

= 1.2.3....8(9-1-8)

=1.2.3......8.0

=0

1234...7x(9-8-1)x8²

=0