作业帮x^2-4x-12≥06-5x-x^2≥00≤x^2+4x≤5x^4-4x^2-12≥0
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x^2-4x-12≥06-5x-x^2≥00≤x^2+4x≤5x^4-4x^2-12≥0
x^2-4x-12≥0
6-5x-x^2≥0
0≤x^2+4x≤5
x^4-4x^2-12≥0
x^2-4x-12≥06-5x-x^2≥00≤x^2+4x≤5x^4-4x^2-12≥0
（负无穷,-2】U【6,正无穷）
【-6,1】
【-5,-4】U【0,1】
（负无穷,-√6】U【√6,正无穷）
x^2-4x-12≥06-5x-x^2≥00≤x^2+4x≤5x^4-4x^2-12≥0
*-----------------------------------------------*| 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 ||
通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20
通分x+4/x*x+4x与x-5/x(x-5)-2(x-5)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
解不等式:x(x-3)≥2x^2-(x+4)(x-5)
|x²-3x-4|＞x+1;以及|x-3|+|x-5|≥2
(x+3x+5x...+2009x)-(2x+4x+6x+...+2010x)
x^2-6x+5/-x^2+4x+12
3x-{-4x+{5x-(12x-10]+2}
1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少
解分式不等式(x+2)/(x+1)+(x+3)/(x+2)≥(x+1)/x+(x+4)/(x+3)
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x^6-x^5+x^4-x^2+x-1
(4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60)
填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
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