From the meaning of the question: x+y+7 = 219x+5y+7× 2 =108, the solution is: x=6 y=8.
A: Xiao Ming "Bu" won "Hammer", and "Hammer" won "Scissors" 6 times and 8 times respectively;
Win one, win two, win three.
Mode "cloth"
win
"Hammer" and "Hammer"
win
Scissors and Scissors
win
"cloth" and "cloth"
win
"Hammer" and "Hammer"
win
Scissors and Scissors
win
"cloth" and "cloth"
win
"Hammer" and "Hammer"
win
"scissors" and "scissors"
win
Boo won.
118134221(2) let Xiaoming win the hammer, the hammer wins the scissors, and the scissors win the cloth x times, y times and z times.
According to the meaning, 9x+5y+2z=30,
Then x= 1, y= 1, and z = 8；; x= 1，y=3，z = 3； x=2，y=2，z= 1。