28(x+y)^4(x-2y)^5/[-7(x+y)^3*(
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28(x+y)^4(x-2y)^5/[-7(x+y)^3*(x-2y)^4].
怎样简便计算
怎样简便计算
![28(x+y)^4(x-2y)^5/[-7(x+y)^3*(](/uploads/image/z/20211818-50-8.jpg?t=28%28x%2By%29%5E4%28x-2y%29%5E5%2F%5B-7%28x%2By%29%5E3%2A%28)
解题思路: 本题主要根据同底数的幂相除底数不变指数相减
解题过程:
原式==[28÷(-7)](x+y)^(4-3)(x-2y)^(5-4)
=-4(x+y)(x-2y)
解题过程:
原式==[28÷(-7)](x+y)^(4-3)(x-2y)^(5-4)
=-4(x+y)(x-2y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
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(2X-3y)-(5x-y)
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