如果,那么A=（）-八年级数学

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• （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
• 下列运算，结果正确的是（）A．1a+1b=1a+bB．2a+1a+1=2C．a÷1a=aD．a+1a2-1=1a-1-数学
• 计算：（1）a2a+3•a2-96a；（2）2mm2-4+mm+2．-数学
• 计算：1x2-4x+4•x2-4x=______．-数学
• —Lucy doesn't mind lending you her dictionary.— She _____. I have already borrowed one. [ ]A. c
• My newly-purchased magazine is nowhere to be found. ____ I left it on the train? [ ]A. Must B. Shoul
• It is required by the rules that students______ get grades not lower than 85％in any subject inorder
• — I ______ have turned on the air conditioner at such a low temperature.— No wonder you've got
• 计算：（1）35×85=______；（2）(-59)×(-310)=______；（3）25÷(-23)______；（4）(-38)÷27=______．-数学
• — I left my handbagon the train, but luckily someone gave itto a railway official.— How unbelievable
• （-b2a）2n的值是（）A．b2+2na2nB．-b2n+2a2nC．b4na2nD．-b4na2n-数学
• 计算题（1）a2-4a2+2a-8÷（a2-4）•a2-4a+4a-2；（2）x2-1x2-4x+4÷（x+1）•x2-3x+2x-1-数学
• Researchfindingsshowwespendabouttwohoursdreamingeverymight,nomatterwhatwe_________havedoneduringthed
• 分式乘以分式，用分子的积做______，分母的积做______；分式除以分式，把除式的分子、分母______后，与被除式______．-数学
• 计算：3a22b•4b9a=______．-数学