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- 1the secret of success in life is for a man to be ready for his opportumity when it comes.
- 2一辆摩托车和一辆大卡车同时分别从甲乙两地开出,相向而行,1.5小时后距终点9千米处两车相遇.已知摩托车每小时行驶的路程比大卡车的1.5倍少2千米,求甲乙两地相距多少千米?
- 3求函数z=f(x^2+y^2)的二阶偏导数,其中f具有二阶连续偏导数
- 4已知函数f(x)=cos四次方x-2sinxosx-sin四次方x.
- 5若方程-x2+3x-m=3-x在x∈(0,3)内有唯一解,求实数m的取值范围.
- 6设集合A={x/x的平方+4x=0},B={x/x的平方+2(a+1)x+a的平方-1=0,a∈R},若B包含于A,求实数a的取值范围
- 7急求"Talk about your family and your hometown"和"holiday plan"为话题的英文对话材料,
- 8优美段落摘抄+赏析 段落200字 赏析100字左右
- 9Some of people go to work by bike because they live far away ,or they like riding bikes.怎么翻译?
- 10我国是世界上最缺水的国家之一,世界人均淡水资源9200立方米,我国人均淡水资源比世界人均淡水资源少3/4.我国人均淡水资源为多少立方米?