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- 1(ab-b平方)(a平方-ab)
- 2已知a,b,c,d四个数满足a+b=1,c+d=1,ac+bd>1. 求证:这四个数中至少有一个是负数.
- 3英文翻译 违反规定
- 4are leaders born or made
- 5已知方程3(3x+3)—1=2x的解和3x+m=四分之m—27的解相同!求m的值
- 6go ,going ,goes ,went的意思
- 7一架飞机所带的燃料,最多可供飞机飞行6小时.进行飞行训练,去时顺风,每小时飞行1500千米;返回时逆风,每小时飞行1200米.飞机最多飞出多长时间,就得往回飞?
- 8I have two children.One is a doctor,_is a teacher.A.another B.other C.the other D.the others
- 91.物体含有的热量多少与温度有关.为什么这题错了?错在哪?
- 10mike explains that pretending to be at the beach is as good as being there