(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)
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(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)(-99)x（-0.125)-99x(-9/11)+
(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)
(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)
(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)
(-99)x（-0.125)-99x(-9/11)+(-99)x(1/8)
=-99(-0.125-9/11+1/8)
=-99(-1/8+1/8-9/11)
=-99(-9/11)
=81
x(x-1)(x-2)...(x-99)(x-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
x-2x+3x-4x+5x.+99x-100x=25求解
(1+x)+x(1+x)+x(1+x)^2+……+x(1+x)^99
2x+x*x=99 求x
(x-1)+x(x+1)=99 = x =
合并同类项x+3x+5x+.+99x
X/2+x/6+X/12+.+x/9900＞99
解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)=
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:x-2x+3x-4x+...+99x-100x=25
计算:1/(x+3)(x+4)+1/(x+4)(x+5).1/(x+99)(x+100)
解方程：x-2x+3x-4x+.+99x-100x=25
计算1/X(X+1)+1/(X+1)(X+2)+.+1/(X+99)(X+100)
解方程,帮帮忙X+3X+5X+7X+9X+...99X+250,
x-2x+3x-4x+...+99x-100x=25