试题来源: 解析 b=3a÷2,b=1.5a,a+1.5a=30,2.5a=30,a=12,12×1.5=18 答:a是12,b是18。 根据题意3a=2b,b=3a÷2,所以b=1.5a,a+b=30,所以a+1.5a=30,2.5a=30,故a=30÷2.5,得12。b=12×1.5,得18。所以a=12,b=18。反馈 收藏 ...
" These are similar requests for directions. Both are correct, but the first one sounds less polite. That is because it is a very direct question. It is not enough to just ask a question correctly. We also n...
Section B, 2b Dear Laura, Thanks for your message. Yes, I'm having a great time on my student exchange program in France. I was a bit nervous before I arrived here,but there was no reason to be. My ho...
Rosemount MultiVariable 变送器是一个卓越的定制解决方案,可测量差压、静态压力和过程温度。此款多变量变送器经济,可减少管道贯穿、导压管和连接系统的需要。此装置还可配备内置流量计算,可实现补偿质量流量测量。紧凑型防腐设计可承受恶劣环境,持久耐用,出色的长期稳定性使其具有一致、可靠的性能,压力测量范围高达 ...
【解析】代数式3a+2b的实际意义可以解释为a的3倍与b的2倍的和故答案为:a的3倍与b的2倍的和.【代数式定义】1、由运算符号(加、减、乘、除、乘方、开方)把数或表示数的字母连接而成的式子,叫做代数式,单独的一个数或者一个字母也是代数式.2、代数式中不可含有“”“”“”等表示相等或不等关系的符号....
代数式3a+2b的实际意义可以解释为___. 答案 代数式的实际意义可以解释为的倍与的倍的和.故答案是:的倍与的倍的和. 结果三 题目 代数式3a+2b的实际意义可以解释为___. 答案 答案: 解析: 答案不唯一,如钢笔3元钱一支,圆珠笔2元钱一支,买a支钢笔和b支圆珠笔共需(3a+2b)元等 结果四 题目 5.代数...
P 78 Section B 2a Hometown Feelings Some people still live in their hometown. However, others may only see it once or twice a year. Nowadays, millions of Chinese leave the countryside to search for work in the...
Section B, 2b He Studies Harder Than He Used to Li Wen is a normal 15-year-old boy from the countryside. He works very hard anddoes well in school. It is hard to believe that he used to have difficultie...
化解成 a=60-b 3（60-b）=2b 180-3b=2b 180=5b 解得b=36 a=60-36=24由A＋b＝60知，3A＋3b＝60×3又3A＝2b，所以2b＋3b＝180即5b＝180，b＝180/5，b＝36，A＝60－A＝60－36＝24A=24，b=36,Ab=24*36=864解法：2*（A+b）=2*60——>2A+2b=120——>2A+...
解答: 解:长为(3a+b),宽为(a+2b)的大长方形的面积为:(3a+b)(a+2b)=3a2+2b2+7ab;A卡片的面积为:a×a=a2;B卡片的面积为:b×b=b2;C卡片的面积为:a×b=ab;因此可知,拼成一个长为(3a+b),宽为(a+2b)的大长方形,需要3块A卡片,2块B卡片和7块C卡片.故答案为:7.点评:本题考查了多项式...