374、(-3,2)(-6,6)(2,-4)组成直角三角,问面积?
ANSWER:0。5×根号(116×29)
怎么算的呀?我怎么觉得这三个点不能构成直角三角形呢?
386.游泳池那道,this side increase 2 feet while other side increase 8 feet,the distance between the two sides is 24 feet,how deep is 4 feet away from the deepest side?
ANSWER: 这道题昨天jj上看到的,当时不会,问了我老公,他用相似三角形做出来的:(24-4)/24=x/(8-2)算出来x=5,但是还需要加上2(大家画一个泳池的截面图就能看出来,我不会用Word画图,不好意思了)。答案是7,我今天就直接选了7。
how deep is 4 feet away from the deepest side,这句话是什么意思啊?没看明白
413 DS : 说R IS THE REMAIDER OF (M-1)(M+1) DIVIDED BY 24, WHAT'S THE VALUE OF R?
1. M IS NOT DIVIDED BY 2 2. M IS NOT DIVIDED BY 3
ANSWER:C 我怎么算出来是E呢?
我怎么算出来是E呢?
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