Question

\(A=1*2*3*4*5*6*7*8*9-1*2*3*4*5*6*7*8-1*2*3*4*5*6*7*8*8\)

Answer 1

= 1*2*3*4*5*6*7*8*(9-1-8)

=1*2*3*4*5*6*7*8*0

=0

Answer 2

tơ dùm

Answer 3

\(A=1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9-1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8-1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot8\)

\(=1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9-1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot1-1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot8\)

\(=1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot\left(9-1-8\right)\)

\(=1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot0=0\)

Answer 4

A=1.2.3.4.5.6.7.8.9 - 1.2.3.4.5.6.7.8 - 1.2.3.4.5.6.7.8.8

A=(1.2.3.4.5.6.7.8).9 - (1.2.3.4.5.6.7.8).1 - (1.2.3.4.5.6.7.8).8

A=(1.2.3.4.5.6.7.8).(9-1-8)

A=(1.2.3.4.5.6.7.8).0 = 0

Answer 5

Đáp án : 0

Thanks 

Học tốt ! 

Answer 6

A=1.2.3.4.5.6.7.8.9 - 1.2.3.4.5.6.7.8 - 1.2.3.4.5.6.7.8.8

=(1.2.3.4.5.6.7.8).9 - (1.2.3.4.5.6.7.8).1 - (1.2.3.4.5.6.7.8).8

=(1.2.3.4.5.6.7.8).(9-1-8)

=(1.2.3.4.5.6.7.8).0

= 0