395.can x divide by 12 1) x divide by 4, reminder 3 2) x divide by 36, reminder 27答案:D 这题的意思是X能被12整除吗?
397.is x^2 + y even, x and y are postive 1) x, y are consective integers 2) x + 2y = 1
397.is x^2 + y even, x and y are postive 1) x, y are consective integers 2) x + 2y = 1答案:A 我觉得由条件2),x和y均为正分数,那么x^2 + y不是even,应该选D呀。请指正!
398. 200 vessels totally cost $1000, remove 12.5 percent defect ones, sold rest at the same price, revenue is 140 percent of the original cost, what is the selling price? 175x = 1000*1.4
398. 200 vessels totally cost $1000, remove 12.5 percent defect ones, sold rest at the same price, revenue is 140 percent of the original cost, what is the selling price? 175x = 1000*1.4
答案:x=8
200×(1-0.125)×P-1000=1.4×1000,则X约为13.7。 请指正! |