解答下列各题：（1）计算：（48+20）-（12-5）；（2）解方程：x2-2x-4=0；（3）解方程：3（x-5）2=2（5-x）；（4）计算：3tan230°+2(sin45°-1)2．-数学

更多内容推荐

• 计算：(24+0.5)-(18-6)．-数学
• 计算（1）计算：(24+0.5)-(18-6)（2）解方程：3x（x-1）=2（x-1）-数学
• My parents have promised to come to see me before I _________ for Africa.A．have leftB．leaveC．leftD．w
• 计算：12-513+0.27+13．-数学
• 计算：3-32+218-1227+18．-数学
• －What’s that terrible noise?－The neighbours _____ the lawn.A．mowB．are mowingC．have mowedD．will mow-高
• After two hours of walking, they came to the camp site, ______ .A．hungry and tiredlyB．hungrily and t
• He went to the payphone to make a call but the phone .A．is brokenB．has brokenC．was brokenD．would bre
• 计算了列各题：（1）15×3520÷（-136）；（2）1327a3-a23a+3aa3-43108a．-数学
• Tom was disappointed that most of the guests _________ when he _________ at the party.A．left; arrive
• Isn’t it lovely to think that I _________ myself on the sunny beach tomorrow at this time?A．am enjoy
• —I’m sure Andrew will win the first prize in the final.—I think so. He _________ for it for months.A
• 下列等式成立的是（）A．a+b=a+bB．53x-43x=6xC．2x27x-6x3x4=3x3xD．3mx-5x=3m-5x-数学
• 15+603-35；17-28+700．-数学
• 化简：20-5=______．-数学
• ----I have got a headache. ---- No wonder. You ________ in front of that computer too long.A．workB．a
• Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
• The discovery of gold in Sahara Desert led thousands to believe that a fortune________.A．is madeB．wa
• —Beg your pardon, but I didn’t quite catch what you said.—Oh, I to myself.A．have talkedB．am talkingC
• —Does your uncle still smoke?—He given it up. It’s two years ever since he .A．can’t have; smokedB．ma
• 解方程：（1）5x-239x+6x4；（2）用配方法解方程：x2-6x+5=0．-数学
• —Have the exam results arrived yet?—No. They were due to have arrived at the school today but appare
• The two friends ______on the Internet for three hours, and they would go on till the next morning.A．
• If you have a job, yourself to it and you’ll succeed.A．don’t devoteB．do devoteC．devotingD．not devote
• 计算23-3的结果是______．-数学
• The doctor suggested he ________with a serious disease and that he ________to hospital at once.A．be
• 计算题：（1）（48+20）+（12-5）；（2）445-35÷(-3410)．-数学
• Every year, the coal workers their lungs X-rayed to ensure their health. A．are havingB．have hadC． ha
• 计算：212-427+348的结果是（）A．0B．-43C．43D．±43-数学
• 化简|3-7|-|-7+52|的结果为______．-数学
• —We’ve spent too much money recently.—Well, it isn’t surprising, Our friends and relatives_______ ar
• The stars who advertise some false medicine _____ for the deaths caused by the medicine.A．are to bla
• — Are you a member of the club?— . It’s years since I .A．Yes; wasB．No; wasC．Yes; had beenD．No; becam
• –Were you at school when he came to see you?–Yes, I ______ a math class.A. was having B. hadC. am ha
• 计算（）-九年级数学
• 计算：32+23-2-3．-数学
• —If it hadn’t been raining so hard, I might have been home much earlier.—It’s too bad you _____ it.
• This time next week I’ll be on vacation .Probably I ________ on the beach.A．am lyingB．have lain C．wi
• The bookinto thirty languages since it came on the market in 1973.A．was translatedB．has translatedC．
• Space exploration began in the 1960s, and since then about five hundred peopleinto space. A．have tra
• 计算：50+8-412．-数学
• 计算：(1-2)2+(2-3)2+…+(9-10)2=______．-数学
• 若x-232-18=2，则x=______．-数学
• 计算：．-八年级数学
• “I in the dormitory, watching the live TV broadcast about the tsunami.” David told the policeman who
• The famous reporter, who is said to have gone back to America last year, _____in China for almost tw
• 6mm9-2m21m．-数学
• （1）计算：33-23+19（2）如果x是(-9)2的平方根，y是64的立方根，求x+y的值．-数学
• If thereno buying and selling of animals, thereno killing in nature. A. is; will beB. will be; will
• —Do you think he can get the first prize for jumping?—Impossible now. Heto do so, but he has just hu