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一道初一解二元一次方程组数学题甲、乙两人同时解方程组mx+ny=-8(1)mx-ny=5(2)由于甲看错了方程（1)中的m,得到的解是x=4 y=2,乙看错了方程中（2）的n得到的解是x=2 y=5,试求正确m,n的值. 用二元一次方程组解!方程组ax+by=2 kx-7y=8的正确解是x=3 y=-2小明解题是看错了系数k的值从而得到解为x=-2 y=2求a b k的值 提问者：XXA1230 - 一级 一道数学题二元一次方程组解4 一道用二元一次方程组解的数学题用含药30%和75%的两种防腐药水,配置含药50%的防腐药水18kg,两种药水各需取多少?（用二元一次方程组解答、要详细步骤） 帮我解一道数学题（二元一次方程组）用白铁皮做罐头盒,每张铁皮可以制作盒身16个或盒底43个一个盒身加两个盒底配套成一个罐头盒,现有150张白铁皮,用几张铁皮制作盒身,多少铁皮制作盒 王大爷承包了25亩土地,今年春季改种茄子和西红柿两种大棚蔬菜,共用去44000元,其中茄子每亩用了1700元,获纯利2400元；种西红柿每亩用了1800元,获纯利2600元.王大爷一共获纯利多少元? 有几道数学题,用二元一次方程解（列二元一次方程组）谢谢~1、2008年全国废水（含工业废水和城镇生活污水）排放总量约572亿吨,排放达标率约为72%,其中工业废水排放达标率约为92%,城镇生活 在全国足球联赛上,某足球队连续12场保持不败,共得28分,根据比赛规则:胜一场得3分,平一场得1分,该足球队胜多少场?平多少场? P 为椭圆X^2/4+y^2/9=1上的一点,点P到一个焦点的距离是2,则点P到另一个焦点的距离是多少? 甲乙同时从A背向出发,沿400m的环形跑道走,甲每分钟走80m,乙每分钟走50m,两人最少用多久再一次在A相遇? 因式分解：x3-y3-x2y+xy2 速度帮我解道数学题!拜托一个酒瓶里面深24cm,底面内直径是16cm,瓶里酒深15cm,把酒瓶盖上后,使其瓶口向下倒立,这时酒深19cm,酒瓶容积是多少ml? 一A、B两班共有84人,A班人数的5/8与B班人数的3/4共58人,则A班有几人?二壹1/2+(1/3+2/3)+(1/4+2/4+3/4)+…+(1/40+2/40+…38/40+39/40)贰1/2+(1/3+2/3)+(1/4+2/4+3/4)+…+(1/60+2/60+…+58/60+59/60)再补一道啊就是一份稿件， 某家商店为了了解某品牌牙刷和牙膏销售情况,对每天销售情况进行记录,星期一卖出该品牌牙刷24支,牙膏18支,收入210元,经核实记录正确.（1）星期二以同样的价格卖出同样的牙刷28支,牙膏12支 求做数学题,请尽量正确. 数学题 告诉我解的过程我国泸深股市交易中,如果买.卖一次股票均需付交易金额的0.5%作费用,张先生以每股5元的价格买入“西昌电力”股票1000股,若他期望获利不低于1000元,问他至少要等到该 解奥数题时,应按什么步骤去做? 解数学题,要过程01.若一个两位正整数,它的个位数字与十位数字的和是5,数字的平方和是17,求这两位数解：设这两位数的十位数字是X,则它的个位数字为（ ）所以这两位数是（ ）根据 1.已知F1,F2是双曲线x^2/16+y^2/20 = 1的焦点,点p在双曲线上.若点p到右焦点F1的距离等于9,求点p到焦点F2的距离是椭圆,我写错了 一桶油,连桶共重35千克.用去一部分油后,这时桶里的油还剩百分之六十,连桶重22.2千克.桶里原来有油多少千克?桶重多少千克?说下怎么列式子的？降下为何 1.写出等差数列3,8,13,...的公差和通顶公式.求等差数列12,8,4,...的公差和通顶公式,并写出a7. 某旅行团有48人要在某招待所住宿,招待所一楼的客房比二楼少五间,如果全部住一楼,每间住5人,则住不满,每间住3人,则不够住,如果全部住二楼,每间住4人,则住不满,每间住3人,则不够住.求招待 英语翻译find the average rate of change of the function over the given intervalsf(x)=x^3 + 1[2,3] [-1,1]g(t)= 2 + cos(t)[0,∏] [-∏,∏]只有翻译也可以怎么求不规则曲线两点间的平均值呢?只有解答也可以 英语翻译writw down 1:the fourth square number2:the fifth fibonacci number3:the sixth square number4:the seventh trianngular number5:the eighth fibonacci number 英语翻译If each foot of water in a lake screens out 60% of the light above,what percent of the light passes through 5 feet of water?Raul invests $1000 in a savings account that earns 5% interest compounded annually.How much money will he have in 英文数学题求翻译求解1. A triangle with angles measuring 90°,30°and 60° is called a ______ triangle using the angle measures.2. A hexa gon has an area of 80 square inches The dimensions of the hexagon are enlarged by a scale factor of 3 t 英语数学题,求翻译求解答A father in his will left all his money to his children in the following manner:$1000 to the first born and 1/10 of what then remains, then $2000 to the second born and 1/10 of what then remains, then $3000 to the th 英语翻译it is given that the scale of the floor plan of a flat is 1 cm to 0.8 m(a)Express the scale of the floor plan in the form of 1:n(b)on the floor plan,the dimensions of the rectangular bedroom are 3cm*2.5com .Find its actual area 英语翻译jane spends1/4of her pocket money on a magazine ,1/3 on sweets and 1/6 on make-upWhat fraction of her pocket money does she spend?What fraction ofher pocket is left?If 80p is left,how much pocket money does she get? “英文数学题”用英语怎么说? 我觉得是A! A 15 foot ladder is placed against a wall.Suppose the bottom of the ladder slides away from the wall at a constant rate of 3 ft.How fast is the top of the ladder sliding down the wall when the bottom is 9 feet from the wall?Answera.- 9/4 ft b.9/4 ft