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1，答案

（1）5x/y (2) a/2b (3)(-x-1 )/ (5x+3)

2，答案要過程

解：原式=9/10*30-1/15*30+1/6*30=27-2+5=30

答案要過程

3，答案

x+1/x=1 (x^2+1)/x=1 x^2+1=x x^2 - x + 1=0 (x-1)^2=0 x=1

4，英語七年級(jí)下冊(cè)階段檢測卷四答案學(xué)子齋

一、單項(xiàng)選擇題(本大題共30小題，每小題2分，60分) 1．When a lady customer intends to buy a coat with white stripes，what is she supposed to place an emphasis on if she says to the shop assistant?． A．“Id like a red coat with white stripes．” B．“Id like a red coat with white stripes．” C．“Id like a red coat with white stripes．” D．“Id like a red coat with white stripes．” 2．Decide on the correct stress pattern of the answer to the question．一Where did he go next? A．He turned to the left at the end of the street． B．He turned to the left at the end of the street． C．He turned to the left at the end of the street． D．He turned to the left at the end of the street． 3．To the scientistsdelight。their efforts have increased peopleS__________of the importance of saving water． A．a(chǎn)wareness B．commitment C．a(chǎn)greement D．response 4．The word“chronology”contains__________morphemes． A．fbur B．three C．two D．five 5．Judging from her speeches and behaviors，Mary has a strict__________． A．growth B．upbringing C．development D．cultivation 6．__________your valuable help，we couldnt have finished the experiment ahead of time． A．If it were not for B．Had it not been for C．Were it not for undefinedD．If it has not been for 7．It Was with great joy__________he knew that his GMAT score was 670，high enough to apply to a top university of business． A．when B．which C．what D．that 8．You can sleep on the couch in the lounge，__________you call go to a hotel nearby． A．a(chǎn)nd B．then C．or D．But 9．In most circumstances，the assumption Of cooperation is 80 pervasive that it can be stated as a cooperative principle of conversation and elaborated in maxims below except__________． A．manner maxim B．quality maxim C．quantity maxim D．a(chǎn)greement maxim 10．Despite differences in conversational style．speakers arehelped by automatic patterns in daily interactions such as“Hi”．“Hi”．known as“ __________ ”． A．a(chǎn)djacency pairs B．preference structure C．dispreference structure D．insertion sequence 1 1．To distinguish sounds，students are encouraged to practice__________． A．minimal paim B．nasal explosion C．constant clusters D．incomplete explosion 12．Which of the following assumptions about vocabulary learning contradicts the modern language teaching theories? A．The best way to learn words is to use them． B．The best way to learn vocabulary is to recite． C．An English dictionary is an important aid to students． D．Learning a word involves learning more than just the word itself． 13．When a teacher intends to introduce a new grammar item，which of the following strategies can be used to get students to notice it? A．Transformation． B．Input enhancement．