3/x=﹙x﹣5﹚/2

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3/x=﹙x﹣5﹚/2

3/x=﹙x﹣5﹚/2
3/x=﹙x﹣5﹚/2

3/x=﹙x﹣5﹚/2
3/x=﹙x﹣5﹚/2
x^2-5x-6=0
(x-5/2)^2=25/4-6
x-5/2=1/2
x=3

3/x=﹙x﹣5﹚/2 *-----------------------------------------------*| 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 || 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 计算:﹙﹣x﹚^4·x^3-x^7-2x^3·(-x)^4 计算:(2x-1)^2-2(x-2)(x+6) 函数f﹙x﹚=﹣x²+2x,x∈[0,3]的值域是 使下列等式成立x²+20x+_____=﹙x+_____﹚²x²-5x+_____=﹙x-____﹚²x²-1/3x+_____=﹙x-______﹚²2x²-7x+_____=2﹙x-____﹚² x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 (x+3x+5x...+2009x)-(2x+4x+6x+...+2010x) 已知﹙3x/x²-1﹚﹢﹙x²-1/3x﹚=5/2,解方程求x 1/﹙2x+3﹚+21/﹙2x³+3x²-2x-3﹚-3/﹙x²-1﹚-1/﹙2x²+5x+3﹚=0 x/x-3-5x/x^2-x-6计算 x^5-x^4+x^3-x^2+x-1 解方程:﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49解方程:1.﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=492.﹙x²-x+1﹚﹙x²-x+2﹚=123.x²+2﹙√2-1﹚x+3-2√2=0 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 先化简,再求值:5x﹙x²+2x+1﹚-x﹙x-4﹚﹙5x-3﹚,其中x=1 计算:x/x-2 - 5x/x²-x-6计算:x/x-3 - 5x/x²-x-6 (3x²-4x+3)²-(2x²-x+7)² 最后一步怎么得来的?(3x²-4x+3) ²—(2x² -x+7)²=[﹙3x²-4x+3﹚+﹙2x² -x+7)][﹙3x²-4x+3﹚-﹙2x² -x+7)] =﹙5x²-5x+10﹚﹙x (3x²-4x+3)²-(2x²-x+7)² 最后一步怎么得来的?(3x²-4x+3) ²—(2x² -x+7)²=[﹙3x²-4x+3﹚+﹙2x² -x+7)][﹙3x²-4x+3﹚-﹙2x² -x+7)] =﹙5x²-5x+10﹚﹙x