UC知道2道SAT数学题...
来源：百度知道 编辑：UC知道 时间：2024/06/24 13:08:21
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 y?
A 4<y<2x
B 0<y<2x
要过程及答案...谢谢！
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 y?
A 4<y<2x
B 0<y<2x
要过程及答案...谢谢！
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)<y
therefore
4<y<2x
答案是A
第一题,共有8个队伍,每个队伍要与其他每个打四场比赛,所以是4*(1+7)*7/2=112场
第二题,你的分太少了^.^