86x+5040-90x=4900
5040-4x=4900
4x=140
x=35
猜你喜欢
- 1The weather report says it will rain today,You'd better take an umbrella with you when you go out
- 2___(...怎么样) read a book?___(努力去做)speak more English ___(我们去...好吗) go to the zoo?
- 3一辆时速是50千米的汽车,需要多少时间才能追上2小时前开出的一辆时速为40千米汽车?
- 4用数学归纳法证明不等式1/(n+1)+1/(n+2)+…+1/(n+n)>13/24
- 5甲,乙两桶油共重30千克,如果把甲桶中6千克油倒入乙桶,那么两桶油重量相等,问甲乙两桶原有多少油?怎么计算呢?
- 6(1)Na2CO3固体中混有少量NaHCO3固体,除去的方法是_____________,化学方程式为________________
- 7设f-1(x)是函数f(x)=log2(x+1)的反函数,若[1+ f-1(a)][1+ f-1(b)]=8则f(a+b)的值
- 8平面直角坐标系怎么组成?
- 9已知A(1,2)B(3,4)C(5,0),则三角形ABC一定是?A等腰三角形但不等边 B等边三角形 C等腰三角形 D直角三角形但
- 10i find this computer game____ to play.选easy enough 还是 easily enough