x-1+2-3+4-5+.-99+100=19.94解法

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x-1+2-3+4-5+.-99+100=19.94解法
x-1+2-3+4-5+.-99+100=19.94解法

x-1+2-3+4-5+.-99+100=19.94解法
-1+2-3+4-5+.-99+100每两个分一组
x+(-1+2)+(-3+4)+...+(-99+100)
=x+1+1+...+1
=x+50=19.94
x=-30.06

x+50=19.94
x=-30.06

x+50=19.94 x=--30.06

先不管x,-1+2-3+4-5+......-99+100就是-1+2,-3+4。。。。。。一共五十对,50乘以1等于50所以就是x+50=19.94,所以x=-30.06

左边等于x加50,由了双数和单数相同多,用正的双加负的单等于一,一共有五十个,就得出结果!30.06

解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x) 1x+2x+3x+4x+5x+6x+7x…+99x=100 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || x-2x+3x-4x+5x.+99x-100x=25求解 计算:1/(x+3)(x+4)+1/(x+4)(x+5).1/(x+99)(x+100) y=|x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|……+|x-99|+|x-100|的最小值为 y=|x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|……+|x-99|+|x-100|+50n的最小值 x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 已知x^4+x^3+x^3+x^2+x^1+1=0,求x^100+x^99+x^98+x^97+x^96的值 x^5-x^4+x^3-x^2+x-1 (1-2)X(2-3)x(3-4)X(4-5)X…X(99-100)=? 难倒爱因斯坦的九宫格X 7 X | X 8 1 | X X X |X X X | X 4 X | 7 5 9 |X X 5 | 7 X 9 | X 1 4 |5 X X | X X 8 | 3 9 X |3 9 6 | 4 X 7 | X X 2 |X 8 7 | 9 X X | X X X |4 X X | 6 X 5 | X X X | X X 4 | X X 1 |2 X X | X X X | X X X | X 3 X | X X X |X 6 (1-2)x (2-3)x(3-4)x(5-6)x...x(99-100)等于多少 1/(x-1)+1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)+...+1/(x-99)(x-100) 如下9*9宫图如何填x x x 1 x x x 2 9x x 5 x x x x x 4x 6 8 x x x x x xx x x 7 x x 5 x xx 2 x x 6 x x 8 xx x 3 x x 9 x x xx x x x 5 x 1 6 x 4 x x x 3 x x x x 7 x x x x 2 x x x x^4+X^3+X^2+X^1+1=0求x^100+X^99+X^98+X^97+X^96的值 已知x^4+x^3+x^2+x^2+1=0,求x^100+x^99+x^98+x^97+x^96的值见上