请将aa-1÷a2-aa2-1+11-a化简，然后从-2、-1、0、1、2中选择一个你认为合适的数作为a的值代入其中求值．-数学

更多内容推荐

• 先化简，再求值：（1a+2-1）÷a2-1a+2，其中a=2．-数学
• 先化简，再求值：a-2a2-4+1a+2，其中a=3．-数学
• ——How wise of you to come round，but why？ ——______ that all is right.A．SeeB．To seeC．SeeingD．For seein
• You can hardly imagine the trouble the woman had______her children.A．brought upB．to bring upC．bringi
• In the reading room, we found her____ at a desk, with her attention____ on a book. A．sitting; fixing
• 化简：3ab-a3b+a2b2a2+2ab+b2÷a2-aba2-b2=______．-数学
• Can you imagine what difficulty he had ____ the work?A．to doB．doC．doingD．done-高二英语
• 先化简代数式2x+6x2-4x+4÷x2+3xx-2-1x-2，然后给x赋一个你喜欢的实数，求代数式的值．-数学
• 计算：①y7x÷(-2x)②a-2a-1-2a-3a-1③12m2-9-2m-3④x2x-1-x-1．-数学
• 先化简，再选择使原式有意义而你喜欢的数代入求值：1x+1-x+2x2-1•x2-2x+1x2+4x+4．-数学
• 先化简，再求值：(xx-1-1x2-x)÷(x+1)，其中x=2．-数学
• All of them try to use the power of the workstation ___ information in a more effective way.A．presen
• （x-xx+1）÷（1+1x2-1），其中x=3-1-数学
• When I came in, I saw her sitting in the sofa ______ in thought.A．to loseB．losingC．lostD．being lost-
• 在解决题目“已知x=2007，求y=x2-2x+1x2-1÷x2-xx+1-1x+1的值”时，小明误将x=2007看成了x=2001，但算出的结果仍然正确，你能说说是为什么吗？-数学
• ____ to Anne's birthday party, Mr. Brown is now searching shop after shop for a nice present fo
• A team, _____ two doctors and three policemen, ____ sent to search for the missing explorers.A．consi
• The living room is clean and tidy, with a dining table already _____ for a meal to be cooked.A．laidB
• 化简并求值：a2+2a+1a2-1-1a-1（其中a=2+1）-数学
• 化简：x2x2-4•2+xx2-2x-1x-2-数学
• 1+112+122=______；1+112+122+1+122+132=______；1+112+122+1+122+132+1+132+142=______；由此猜想1+1n2+1(n+1)2=_
• 计算：①-4x4-4-12-x；②a2a-1-a-1；③(x+2x2-2-x-1x2-4x+4)•xx-4，其中x=1；④15×3520÷(-136)；⑤45+1220-515．-数学
• 计算下列各题．（1）(x+y)•x2x2-y2+y2y-x；（2）a+2-42-a（3）a2-b2a2b+ab2÷a2-2ab+b2ab•1(b-a)2；（4）(x+2x-2+4x2-4x+4)÷xx
• 先化简3x+3x2-1-2x-1，然后选择一个合适的你最喜欢的x的值，代入求值．-数学
• A small plane crashed into a hillside five miles east of the city, _________ all the four people on
• Tony is a quiet boy and he is accustomed ______ at meals, which is always appreciated.A．not to talkB
• 先化简代数式：(x+2x2-2x-1x-2)÷2x2-4，请你取一个x的值，求出此时代数式的值．-数学
• 化简题：（1）2x-64-4x+x2÷(x+3)×x2+x-63-x；（2）-(-a2b)2•(-b2a)3•(1ab)4•(2a3)；（3）2+3yx2-3yx-12x+y312x-y3；（4）3-
• 化简：（xx-y-2yx-y）•xyx-2y÷（1x+1y）-数学
• Before us lies the biggest room, ________with things like guns, dolls and old clothes.A．fillingB．fil
• _____ to try his fortune abroad, he left for America.A．Having determinedB．Being determinedC．Determin
• 先化简，再选择你喜欢的数代入求值：（m+2m2-2m-m-1m2-4m+4）÷m-4m．-数学
• 先化简后求值：（1+1a-1）÷（aa2-1-aa+1），其中a=14．-数学
• 先化简，再求值：3x2-xy9x2-6xy+y2，其中x=43，y=-23．-数学
• 计算（xx-2-xx+2）÷4x2-x的结果是（）A．1x+2B．-1x+2C．-1D．1-数学
• 先化简，再求值：6m2-9÷2m-3-mm+3，其中m=2．-数学
• 先化简，再求值：x•（1-1x）+xx2+3x•（x2-9），其中x=1005．-数学
• I stayed up late doing my homework yesterday, so I had trouble _____ up early this morning.A．getB．ge
• In the lecture, little Tom kept silent all the time unless _________ to express his opinion.A．he inv
• 当a=-3，b=2时，求代数式3a2-ab9a2-6ab+b2的值．-数学
• 先化简，再求代数式a+1a-3-a-3a+2÷a2-6a+9a2-4的值，其中a=6．-数学
• 计算：(1a+2-1a-2)÷4a2，并求出a=-1时的值．-数学
• 已知x-2y=0，求2x+yx2-2xy+y2•(x-y)的值．-数学
• The students were all standing by the swimming pool, ______ swimming suits.A．all of them wornB．all w
• 有这样一道题“计算x2-2x+1x2-1÷x-1x2+x-x的值，其中x=2005”．甲同学把条件“x=2005”错抄成”x=2050“，但他的计算结果也是正确的，你说这是怎么回事？试一试，你就会有收
• 先将(x+2x-2+4x2-4x+4)÷xx-2化简，然后请你选取一个你喜欢且又合理的x的值，求原式的值．-数学
• We’re conducting a nationwide survey of people’s reading habits. Would you have five minutes _______
• ________ deep down in the earth for thousands of years, the dead forest has rotted away and become c
• Though ______small talk, Roy managed to have lively conversation with strangers.A．lackedB．lacking o
• ___________ the man who lost the purse, Mike had to stay there longer.A．Not findingB．Not foundC．Not