2道SAT数学题...At a basketball tournament involving 8 teams,each team_英语解答

2道SAT数学题...
At a basketball tournament involving 8 teams,each team played 4 games with each of the other teams.How many games were played at this tournament?
The lengths of two sides of a triangle are (x-2)and (x+2),where x>2.Which of the following ranges includes all and only the possible values of the third side
A 4

人气：148 ℃　时间：2020-05-10 04:50:49

解答

第一题：（7+6+5+4+3+2+1）*4=112
第二题：第三边一定要小于两边的和,大于两边的差的绝对值
所以(x-2)+(x+2)>y
(x-2)-(x+2)