先化简，再求值：（a-1+2a+1）÷（a2+1），其中a=2-1．-数学

更多内容推荐

• After hearing the bad news, Susan found herselfof it from time to time while at work.A．to thinkB．thi
• The elderly mother sits in the armchair,at the family picture on the wall quietly.A．staringB．being s
• 计算：(a-1+4aa-1)(1+a-4aa+1)．-数学
• While watching TV, _.A．the telephone rangB．the telephone was ringingC．the telephone was heard ringD．
• It is a truth universally ______ that a single and rich man must be in want of a wife.A．achnowledgin
• 先化简，再求值：(1x2-2x-1x2-4x+4)÷2x2-2x，其中x=1．-数学
• --The first one ________ the finishing line wins the gold medal.--True!A．reachesB．reachedC．to reachD
• 先化简（1x-1-1x+1）÷x2x2-2，然后从-1，1，2中选取一个数作为x的值代入求值．-数学
• 化简分式(y-2y+2-y+2y-2)•y2-2yy2，并选一个你喜欢的值代入求分式的值．-数学
• He explained to the class what he suggested ____ his idea ____．A．to make, acceptedB．making, agreed t
• --Did Peter repair his bike?--He _______, because he could’t do that himself.A．had it repairedB．had
• Would you please make up a topic worth______ at tomorrow’s meeting?A．discussingB．discussedC．to be di
• ________ so delicious, the food in this market was sold out soon.A．TastedB．TastingC．Being tastedD．Ha
• 有这样一道题：计算x+x2-4x-x2-4+x-x2-4x+x2-4-x2（x＞2）的值，其中x=1005．某同学把“x=1005”错抄成“x=1050”，但他的计算结果是正确的，请回答这是怎么回事？
• _______ with care, one paper-bag will last for six weeks.A．Use B．Using C．Used D．To use-高三英语
• Song Zuying became the first Chinese singer _______ a solo concert at the Vienna Golden Hall , _____
• One of the world’s largest art galleries is the Louvre, ______ in Paris, which is also famous for it
• The boy insisted ______ in a nearby school. A．to be taughtB．being taughtC．on being taughtD．on teachi
• 计算：。-九年级数学
• 先化简，再求值：(x+2x2-2x-x-1x2-4x+4)÷x2-16x2+4x，其中x=2+2．-数学
• 先化简，再求值：(2a-1-1a+1）×（a2-1），其中a=3-3．-数学
• 先化简，再求值：（x2+4x-4）÷x2-4x2+2x，其中x=-1．-数学
• 先化简，再求值：当a=2+时，=（）。-八年级数学
• Little Tom went to the stadium in a hurry, only ____________ the game had been put off.A．Being infor
• North Korean（朝鲜）leader Kim Jeong-eun has sent urgent messages to world leaders Saturday, ________ t
• My classmate regretted ______ me that they had regretted _____ paying a visit to the car show yester
• .I think I had at least a billion test, __ one in which they cut out a piece of muscle from my leg.
• Today my job at home is ______ and my father’s is ______.A．to wash clothes; to cook dinnerB．washing
• twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in th
• 先化简再求值，其中，-八年级数学
• 将代数式尽可能化简，并选择一个你喜欢的数式入求值：2a-(a+1)+a2-1a-1．-数学
• For some reason, we hurriedly ended our meeting, a lot of problems to be settled.A．leaving B．to lea
• 先化简，再求值：（1-1x）÷x2-2x+1x2-1，其中x=2．-数学
• 先化简，再求值：（2-4x）÷x2-4x，其中x=-4．-数学
• 已知实数a满足a2+2a-8=0，求1a+1-a+3a2-1×a2-2a+1a2+4a+3的值．-数学
• 先化简，再求值：，其中-九年级数学
• Canada，Australia and New Zealand are all ____ countries.A．spokenEnglish B．EnglishspokenC．speaking
• 化简：(1x-1x+1)•x-数学
• As time went by, the plan he stuck ____ fairly practical. A．to provedB．to provingC．provedD．to be pro
• 化简：（4x2-4+1x+2）÷1x-2-数学
• with an important decision, one that can affect his future, he doesn’t know what to do.A．FaceB．Faci
• David stayed inside himself, ______ to be alone, or in a corner of the cabin.A．to wantB．wantedC．bein
• 化简：(4x2-4+1x+2)÷1x-2-数学
• I can’t stand _____ with Jane in the same office. She just refuses ____ talking while she works.A．wo
• 先化简，再求值：，其中x=，y=-九年级数学
• 先化简，再求值：(3xx-1-xx+1)×x2-1x，其中x=2-2．-数学
• 先化简，再求值：9-6m+m22m-4÷(m+2-5m-2)，其中m=3-3．-数学
• 若x2-9=0，求分式x2-5x+6x-3的值．-数学
• The detective,____ to be reading a newspaper, glanced at the man_____ next to a woman.A．pretending,
• 当x=3-12时，求代数式(x2-x+2x2-1-1x-1)÷(1-1x-1)的值．-数学