999 x 998998999 - 998 x 999999998全过程.

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999 x 998998999 - 998 x 999999998全过程.
999 x 998998999 - 998 x 999999998
全过程.

999 x 998998999 - 998 x 999999998全过程.
=999 x (998998998+1) - 998 x (999999999 -1)
=（999 x 998 x 1001001 +999）-（998 x 999 x1001001 -998)
=998 + 999
=1997

999 x 998998999 - 998 x 999999998
=999 x (998 x 1001001+1)-998 x (999 x 1001001-1)
=999+998
=1997

999 x 998998999 - 998 x 999999998
=999 x （999999999-1001000） - （999-1） x （999999999-1 ）
=999 x 999999999-999999000-999 x 999999999+999+999999999-1
=2x999-1
=2000-3
=1997

(998+1)*998998999-998*999999998=998*(-999999998+998998999)+998998999=-1000999*998+998998999=-998997002+998998999=1997

解:原式=999*(998*1001001+1)-998*(999*1001001-1)
=999*998*1001001+999-998*999*1001001+998
=999+998
=1997

999 x 998998999 - 998 x 999999998
=999x(998000000+998000+999)-998x(999000000+999000+998)
=999x998000000+999x998000+999x999-998x999000000-998x999000-998x998
999x998000000=999x998x1000000=9...

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999 x 998998999 - 998 x 999999998
=999x(998000000+998000+999)-998x(999000000+999000+998)
=999x998000000+999x998000+999x999-998x999000000-998x999000-998x998
999x998000000=999x998x1000000=998x999000000
999x998000=999x998x1000=998x999000
所以原式=999x999-998x998=(999+998)x(999-998)=1997
不知道说得是否明白

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999 x 998998999 - 998 x 999999998全过程. 101 X 99 X 999 + 999简算, 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 计算：99*101*10001+1 204*196 999的2次方-1002*998 解方程：2（x-2)-x的2次方=x-(x-1)(x+1) 999 x 998998999 - 998 x 999999998x=乘号要全过程啊····要简算 x^3+x^2+x=999,x等于多少 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 1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+999)(x+1000) x(x+1)分之一+（x+1)(x+2)分之一+..+（x+999）（x+1000）分之一解方程：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)=