不改变分式的值，化简下列各分式的分子、分母的系数为整数，其结果不正确的是（）A．12a+13b12a-13b=3a+2b3a-2bB．1.3x-0.8y2x-0.7y=13x-8y2x-7yC．0.0

更多内容推荐

• 请从下列三个代数式中任选两个（一个作为分子，一个作为分母）构造一个分式，并化简该分式，然后请你自选一个合理的数代入求值．a2-1，a2-a，a2-2a+1．-数学
• 通分：（1）ca2b4与-a2bc3；（2）1x2-4与x4-2x．-数学
• 已知1a+1b=5（a≠b），求ab(a-b)-ba(a-b)的值．-数学
• — Shall I inform him of the change of the schedule right now?— I’m afraid you _____.A．willB．mayC．mus
• It has been announced that students _______ remain in their seats until all the papers have been col
• — Oliver looks a bit upset, did you tell him the bad news?— Yes, but I _____ him after his birthday
• 已知分式的值是a，如果用m，n的相反数代入这个分式所得的值是b，问a与b的关系是否能确定？若能确定，求出它们的关系，若不能确定，请说明理由-八年级数学
• 下列计算或化简正确的是[]A．a2+a3=a5B．C．D．-九年级数学
• 已知，求分式的值。_________-八年级数学
• — Where will you start your work after graduation?— Mmm, it's not been decided yet. I ________
• 下列等式正确的是[]A.B.C.D.-八年级数学
• 分式中的字母x、y都扩大为原来的3倍，（）则分式的值[]A.不变B.扩大为原来的3倍C.扩大为原来的9倍D.缩小为原来的-八年级数学
• 如果,那么A=（）-八年级数学
• 分式的基本性质：分式的分子、分母同乘（或除以）同一个（），分式的值不变，分式的符号法则：分式的分子、分母及分式本身，三者的符号改变其中（）分式的值不变。-八年级数学
• （m≠0）[]-八年级数学
• Hannah ________me; otherwise, other students wouldn't have known my result of the quiz.[ ]A. ma
• I ________ have watched that movie-it'll give me horrible dreams.[ ]A. shouldn'tB. needn&#
• 小明、小华、小颖三名同学解这样一个问题：求a为何值时，成立．小明：因为a2+2a﹣3=（a﹣1）（a+3），从分式的右边知，分式的分子和分母同时除以a﹣1，只需a﹣1≠0即可，故a的取值范围是-八年级
• Hiking trips ________ sound exciting to most kids, but few realize they ________ be uncomfortable an
• It was dangerous for you to swim in that river. You eaten by the fish. [ ]A. might have beenB. must
• —Will you read me a story ,Mummy?—OK.You________ have one if you go to bed as soon as possible.[ ]A.
• --Mary I smoke here?-- If you , choose a seat in the smoking section.[ ]A．shouldB．couldC．mustD．may-高
• 化简下列各式：（1）（2）（3）（4）-八年级数学
• 把分式中的x和y都扩大为原来的5倍，这个分式的值[]A.扩大为原来的5倍B.缩小了5倍C.不变D.扩大为原来的2.5倍-八年级数学
• 根据分式的基本性质填空：。-八年级数学
• 不改变分式的值，使的分子和分母中x的最高次项的系数都是正数，应该是[]A．B．C．D．-八年级数学
• 不改变分式的值，如果把其分子和分母中的各项的系数都化为整数，那么所得的正确结果为[]A．B．C．D．-八年级数学
• —Listen! There is a knock on the door.Who _____ it be?—It must be Jack.Just now I sent for him. [ ]A
• According to the school rules, no student _______ go out of school without the permission of the tea
• Just be patient. You ________ expect the world to change so soon. [ ]A. can'tB. needn'tC.
• — Listen ! There is a knock on the door. Who ________ it be?— It must be Jack. Just now I sent for h
• This basketball team had lots of excellent players, so its fans never expected that it_______ have f
• Mr. White, many customers want to see you._______ they wait here or outside?[ ]A. Will B. Shall C.Ca
• —Tom is never late for work. Why is he absent today? —Something_____ to him.[ ]A. must happenB. shou
• 计算：（1）4a2b215m3÷-8ab235m2；（2）（xy-x2）÷x-yxy．-数学
• Mark _____ havehurried. After driving at top speed, he arrived half an hour early.[ ]A. needn't
• — What do you think we can do for these sad people?— You ____ do anything except to wait quietly.[ ]
• 计算：a3x2•-x3a2=______．-数学
• — Did you tell Rose about the test? — Oh, no, I forgot. Icall her now.[ ]A. will B. can C. shouldD.
• — I had to take a taxi home yesterday because my car broke down.— You ____. I was not using it.[ ]A.
• 下面的计算正确的是（）A．8a2÷b22=4a2b2B．（a-b）÷1(a-b)2×（a-b）2=a-bC．（a-b）÷1(a-b)2×（a-b）2=（a-b）5D．15a2÷3ab=5ab-数学
• 化简a4-a2b2(a-b)2÷a(a+b)b2•b2a的结果是______．-数学
• — The contest is so easy, but you fail to pass it.— I'm sorry it ______ be this way. [ ]A. need
• — Good morning. I've got an appointment with Miss Smith in the Personnel Department. — Ah, good
• How disappointing it was that I _____ the wonderful football match. [ ]A. may have missedB. should h
• 计算：（1）6a8y•2y23a2=______；（2）x+1y÷x2-1y2=______．-数学
• 计算3xy24z2•(-8z2y)等于（）A．6xyzB．-6xyC．-3xy2-8z34yzD．6x2yz-数学
• （1）化简：x2-9x2+6x+9•12x-6（2）解方程：7x-2=5x．-数学
• Doctors say that exercise is important for health, but it _____ be regular exercise. [ ]A. can B. wi
• 化简2x+2y5a2b•10ab2x2-y2的结果为______．-数学