>
数学
>
当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+…-(x+99y)=______.
人气:467 ℃ 时间:2020-03-25 11:17:20
解答
原式=x-x+x-x+…+(2y-y)+(4y-3y)+…+(98y-97y)-99y
=49y-99y
=-50y,
当x=1,y=-2时,原式=-50×(-2)=100.
故答案为:100.
推荐
当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+…-(x+99y)=_.
当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+…-(x+99y)=_.
当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+…-(x+99y)=_.
当X=1,Y=-2时,代数式X-(X+Y)+(X+2Y)-(X+3Y)+…-(X+99Y)的值是
已知代数式3y2-2y+6的值为8,那么代数式3/2y2-y+1的值为_.
1.互为相反数的两个数大小相等.2.互为相反数的两数的和等于零
汉译英!速来人!翻译器绕道!
Do you still remember that i said last time?这句话有语法错误吗?
猜你喜欢
抽查200包方便面的质量,结果有1包不合格.这些被抽查方便面的合格率是多少
已知集合A=[x|x=2k+1,k属于Z},B={x|x=3m+2,m属于Z},则A交B为
沉思的近义词
petrol is now more expensive than ever the cost for family cars are growing higher and higher ,but
don't often的同义词
巫峡赏雾引用诗句有什么作用
have a look at怎么翻译
There is a river ( ) two villages
© 2025 79432.Com All Rights Reserved.
电脑版
|
手机版