搜搜考试网-25x^3y+20x^2y^2-4xy^3
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-25x^3y+20x^2y^2-4xy^3
先化简,再求值.
(-5ab^2)^3+65(ab)^2 ·(-b^2)·(-a) 其中a=1,b=1
先化简,再求值.
(-5ab^2)^3+65(ab)^2 ·(-b^2)·(-a) 其中a=1,b=1
-25x^3y+20x^2y^2-4xy^3
=-xy(25x^2-20xy+4y^2)
=-xy(5x-2y)^2
(-5ab^2)^3+65(ab)^2 ·(-b^2)·(-a)
=-125a^3b^6+65a^3b^4
=-5a^3b^4(25b^2-13)
其中a=1,b=1
原式=-5a^3b^4(25b^2-13)=-5（25-13）=-5X12=-60
=-xy(25x^2-20xy+4y^2)
=-xy(5x-2y)^2
(-5ab^2)^3+65(ab)^2 ·(-b^2)·(-a)
=-125a^3b^6+65a^3b^4
=-5a^3b^4(25b^2-13)
其中a=1,b=1
原式=-5a^3b^4(25b^2-13)=-5（25-13）=-5X12=-60
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