(X^2-2X+3)(X^-4X+7)结果全部拆开来,但我死活算不对,最好是一步步算清楚
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![(X^2-2X+3)(X^-4X+7)结果全部拆开来,但我死活算不对,最好是一步步算清楚](/uploads/image/z/7630627-67-7.jpg?t=%28X%5E2-2X%2B3%29%28X%5E-4X%2B7%29%E7%BB%93%E6%9E%9C%E5%85%A8%E9%83%A8%E6%8B%86%E5%BC%80%E6%9D%A5%2C%E4%BD%86%E6%88%91%E6%AD%BB%E6%B4%BB%E7%AE%97%E4%B8%8D%E5%AF%B9%2C%E6%9C%80%E5%A5%BD%E6%98%AF%E4%B8%80%E6%AD%A5%E6%AD%A5%E7%AE%97%E6%B8%85%E6%A5%9A)
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(X^2-2X+3)(X^-4X+7)结果全部拆开来,但我死活算不对,最好是一步步算清楚
(X^2-2X+3)(X^-4X+7)结果
全部拆开来,但我死活算不对,最好是一步步算清楚
(X^2-2X+3)(X^-4X+7)结果全部拆开来,但我死活算不对,最好是一步步算清楚
原式=x²(x²-4x+7)-2x(x²-4x+7)+3(x²-4x+7)
=x⁴-4x³+7x²-2x³+8x-14x+3x²-12x+21
=x⁴-6x³+10x²-18x+21
(X²-2X+3)(X²-4X+7)
=x²(x²-4x+7)-2x(x²-4x+7)+3(x²-4x+7)
=x⁴-4x³+7x²-2x³+8x²-14x+3x²-12x+21
=x⁴-6x³+18x²-26x+21
盼采纳!
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*-----------------------------------------------*| 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 ||
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
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
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解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
2x+3x+4x+5x+x+6x+7x=100
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15)
[(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)]
x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少
解决数独问题x 1 x 7 x x x 3 xx x x x 4 x 2 x x9 x 3 6 x 8 7 x 58 x x x x 9 x x xx x 2 x 5 x x x 4x 3 x x x x 6 x xx x x x x x x x 26 x x x x x x x 7x 5 4 1 7 x 9 8 x这道题我用了很多办法都没有头绪,请帮忙的朋友把解题的思
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(x+3x+5x...+2009x)-(2x+4x+6x+...+2010x)
解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
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