[計量] 請問三題數學
1.
m^2+n^2=7
ColumnA ColumnB
_______ _______
m+n 5 答案:D
2.If a motorist had driven 1 hour longer on a certain day
and at average rate of 5 miles per hour faster, he would have
covered 70 more miles than he actually did. How many more
miles would he have covered than he actually did if he had
driven 2 hours longer and at an average rate of 10 miles per
hour faster on that day?
ans:150
3.Solution Y is 30 percent liqid X and 70 percent water. If
2 kilograms of water evaporate from 8 kilograms of solution Y
and 2 kilograms of solution Y are added to the remaining 6
kilograms of liquid, what percent of this new solution is liquid X?
ans:37.5%
請好心人解釋一下..
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※ 編輯: toughbank 來自: 218.168.64.65 (08/11 11:20)
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