下面这四道题,谢谢!!!
1个回答
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11.
-(-x^2)*(-2x^2y)^3+2x^2(x^6y^3-1)
=-8x^8y^3+2x^8y^3-2x^2
=-6x^8y^3-2x^2
12.
x(x^2-1)+2x^2(x+1)-3x(2x-5)
=x^3-x+2x^3+2x^2-6x^2+15x
=3x^3-4x^2+14x
13.
(0.125)^16*(-8)^16
=(-0.125*8)^16
=(-1)^16
=1
14.
[(-5/14)^502]^4*(2 4/5)^2009
=(-5/14)^2008*(14/5)^2009
=(-5/14)^2008*(14/5)^2008*(14/5)
=[(-5/14)*(14/5)]^2008*14/5
=(-1)^2008*14/5
=14/5
-(-x^2)*(-2x^2y)^3+2x^2(x^6y^3-1)
=-8x^8y^3+2x^8y^3-2x^2
=-6x^8y^3-2x^2
12.
x(x^2-1)+2x^2(x+1)-3x(2x-5)
=x^3-x+2x^3+2x^2-6x^2+15x
=3x^3-4x^2+14x
13.
(0.125)^16*(-8)^16
=(-0.125*8)^16
=(-1)^16
=1
14.
[(-5/14)^502]^4*(2 4/5)^2009
=(-5/14)^2008*(14/5)^2009
=(-5/14)^2008*(14/5)^2008*(14/5)
=[(-5/14)*(14/5)]^2008*14/5
=(-1)^2008*14/5
=14/5
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