Step by Step 3000. Book Four. Unit 3. Work and Workforce. Part 1. Warming up. A.Keywords. my job. Vocabulary. on top of, self-worth. Listen to three people talking about their jobs. Guess what job they each are engaged in and supply the corresponding key words. 1. Psychologist. May...
3.答案:被某人解析:by+动作执行者表示“被某人”,用在被动语态结构中。如:The book was written by Lu Xun.这本书是被鲁迅写的。4.4.【答案】1)by the window; 2) walk by; 3) learn... by heart; 4)by doing sth; 5)by 5 o'clock; 6)by sb.; 7)by bus【解析】1)by,介词,在......
第4部分 语言学习与理解。 Listen to the following statements, pay special attention to the parts in bold type. 请听下面的陈述,特别注意粗体字部分。 Learn to appreciate and use the language. 学会欣赏和使用语言。 1. to excel in. 1. to excel in. The University excels in sport, social activi...
已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.(1)直线l1过点(-3,-1),并且直线l1与l2垂直;(2)直线l1与直线l2平行,并且坐标原点到l1,l2的距离相等.
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在解方程组 ax+5y=10 4x-by=-4 时,由于粗心,甲看错了方程组中的a,而得解为 x=-3 y=-1 ,乙看错了方程组中的b,而得解为 x=
解:(1)①根据题意得:F(1,-1)=a-b=-1,F(2,0)=2a=4,解得:a=2,b=3;②根据F(x,y)=ax+by,F(3-2p,2)=2(3-2p)+6=12-4p,F(1,2-3p)=2+3(2-3p)=8-9p.∴ \begin{cases} {12-4p\geq 4\textcircled{1} } \\ {8-9p<-1\textcircled{2} }\end{cases},解不等式...
19:30 Giveaway by Torey Krug 0 0 20:00 End of 1st Period 0 0 Regular Season Series STL leads 1-0 Devils 1 Blues 4 Game 1 11/4 Final Blues 1 Devils 4 Game 2 3/8 Final Game Information Enterprise Center 8:00 AM, November 4, 2023Coverage: NHLPP|ESPN+ Saint Louis, MO Line: ...
坐等3—4~~~
【解析】将 x=1;y=2.x=-1;y=-3.分别代入方程2ax-by=4得: 2a-2b=4;-2a+3b=4.解得: a=10;b=8.【定义】能使二元一次方程左右两边的值相等的两个未知数的值,叫做二元一次方程的解.由于使二元一次方程的左右两边的值相等的未知数的值不止一组,故每个二元一次方程都有无数组解.【判...