三道因式分解题和一道化简题x²-21xy+98y²+x-7yx的三次方-6x²+11x-6x的四次方+x的三次方-3x²-4x-4
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![三道因式分解题和一道化简题x²-21xy+98y²+x-7yx的三次方-6x²+11x-6x的四次方+x的三次方-3x²-4x-4](/uploads/image/z/5437217-65-7.jpg?t=%E4%B8%89%E9%81%93%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E9%A2%98%E5%92%8C%E4%B8%80%E9%81%93%E5%8C%96%E7%AE%80%E9%A2%98x%26%23178%3B-21xy%2B98y%26%23178%3B%2Bx-7yx%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9-6x%26%23178%3B%2B11x-6x%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%2Bx%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9-3x%26%23178%3B-4x-4)
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三道因式分解题和一道化简题x²-21xy+98y²+x-7yx的三次方-6x²+11x-6x的四次方+x的三次方-3x²-4x-4
三道因式分解题和一道化简题
x²-21xy+98y²+x-7y
x的三次方-6x²+11x-6
x的四次方+x的三次方-3x²-4x-4
三道因式分解题和一道化简题x²-21xy+98y²+x-7yx的三次方-6x²+11x-6x的四次方+x的三次方-3x²-4x-4
x²-21xy+98y²+x-7y
=(x-7y)(x-14y)+x-7y
=(x-7y)(x-14y+1)
x的三次方-6x²+11x-6
=x³-6x²+5x+6x-6
=x(x²-6x+5)+6(x-1)
=x(x-1)(x-5)+6(x-1)
=(x-1)(x²-5x+6)
=(x-1)(x-2)(x-3)
x的四次方+x的三次方-3x²-4x-4
=x的四次方+x³+x²-4x²-4x-4
=x²(x²+x+1)-4(x²+x+1)
=(x²+x+1)(x²-4)
=(x-2)(x+2)(x²+x+1)
[√a+(a-b)/(√a+√b)](√a-√b)-(√a-3√b)√a
=a-√ab+(a-b)(√a-√b)²/[(√a+√b)(√a-√b)]-a+3√ab
=2√ab+(a-b)(a-2√ab+b)/(a-b)
=2√ab+a-2√ab+b
=a+b