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

更多内容推荐

• 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
• 先化简，再求值：(1+a1+a)÷(1-3a21-a2)•1a-1，其中a=-32-数学
• She was disappointed to see the beautiful coat _____ she had bought the day before ______ with a lot
• Do you mind _____ alone at home?A．Jane’s leavingB．Jane having leftC．Jane being leftD．Jane to be lef
• 先化简再求值：a-ba+2b÷a2-b2a2+4ab+4b2-1，其中a=b=1．-数学
• 先化简，再求值：2x-1-1x2-1•x2+2x+1x-1，其中x=3+1．-数学
• 先化简，再求值x2-xyx2÷(xy-yx)，其中x=2-2，y=2．-数学
• 当a=2时，求（4a2-1-2a2+a）÷1a-1的值．-数学
• This machine is very easy______. Anybody can learn to use it in a few minutes. A．operating B．to be o
• 先化简再求值：（1+b+b21-b）÷1+b1-b，其中b=3．-数学
• 先化简，再求值：a2-b2a-b÷(2+a2+b2ab)，其中a=2，b=1．-数学
• 若ab=-2，a+b=1，则1a+1b的值为______．-数学
• ___ an important decision more on emotion than on reason, you will regret it sooner or later.A．Based
• We are looking forward to seeing the new exam system_____ in the near future.A．to be carried outB．ca
• If ____unsolved, the problem of food safety may lead to more serious results.A．leftB．makingC．remaine
• Everyone hates ________ in public.A．to laugh atB．to laughC．being laughedD．being laughed at-高一英语
• 先化简后求值：x2x-2-4x-2，其中x=2-2．-数学
• 先化简，再求值：x-2x-1÷(x+1-3x-1)，其中x=-1．-数学
• 先化简，后求值：(3-xx+2)(x+2)，其中x=-32．-数学
• 先化简，后求值．（1）已知：x=-2，y=-1，求(xx-y-1)÷y2x+y•(x-x2x+y)的值．（2）a=12+3先化简a；再化简a2-2a+1a2-a的值（3）已知x+y=-5，xy=3，求
• 先化简，再求值：(1-1x+3)÷x2-4x2+3x，其中x=6．-数学
• 有一道题：当x=1-3时，求代数式(x2-1)(x+1)x2-x÷(1+x2+12x)的值．小亮同学做题时，没有把“x=1-3”代入，但他的计算结果也是正确的，请解释这是怎么回事．-数学
• Finding her car stolen, ______A．a policeman was asked to helpB．the area was searched thoroughlyC．it
• What is the way George thought of ______ enough money to buy the house?A．to getB．gettingC．having got
• 先化简，再求值：（x+1-15x-1）÷x+4x-1，其中x=52-4．-数学
• 已知a-b=5ab，则2a+3ab-2ba-b-2ab的值是______．-数学
• He set out early after supper_________ be late for the film.A．in order to notB．so not as toC．in not
• 计算：x2+y2x+y-x-y．-数学
• His first book ______ next month is based on a true story of his family. A．publishedB．to be publish
• The policeman kept his eyes________on the screen of the computer to identify the criminal's fo
• (3xx-2-xx+2)×x2-4x．-数学
• （1）化简：45+1220-515（2）先化简，再求值：aa+3-3a-9a2-9，其中a=1．-数学
• (xy-x2)÷x2-2xy+y2xy•x-yx2-数学
• 先化简，再求值：2xx-3+x3-x，其中x=-1．-数学