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整式的乘法(要过程)2ab(5a^2b+3ab^2)(3分之2ab^2-2ab)*2分之1ab5X(2x^2-3x+4)

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整式的乘法(要过程)
2ab(5a^2b+3ab^2)
(3分之2ab^2-2ab)*2分之1ab
5X(2x^2-3x+4)
-2a^2(2分之1ab+b^2)
-6x(x-3y)
(3分之2x^2-6xy)*2分之1xy^2
x(y-z)+y(z-x)-z(y-x)
-x(x^2-x+1)+(-x)^2*(x^2+2x-1)
先化简,再求值:x^2(x^2-xy+y)-x*(x^3-2x^2y+xy-1),其中|X-2|+(y+4分之1)^2=0
已知:xy^2=-2,求-xy(x^3y^7-3x^2y^5-y)的值
整式的乘法(要过程)2ab(5a^2b+3ab^2)(3分之2ab^2-2ab)*2分之1ab5X(2x^2-3x+4)
2ab(5a^2b+3ab^2)=10a^3b^2+6a^2b^3
(3分之2ab^2-2ab)*2分之1ab=1/3a^2b^3-a^2b^2
5X(2x^2-3x+4)=10x^3-15x^2+20x
-2a^2(2分之1ab+b^2)=-a^3b-2a^2b^2
-6x(x-3y)=-6x^2+18xy
(3分之2x^2-6xy)*2分之1xy^2=1/3x^3y^2-3x^2y^3
x(y-z)+y(z-x)-z(y-x)
=xy-xz+yz-xy-yz+xz
=0
-x(x^2-x+1)+(-x)^2*(x^2+2x-1)
=-x^3+x^2-x-x^4-2x^3+x^2
=-x^4-3x^3+2x^2-x
先化简,再求值:x^2(x^2-xy+y)-x*(x^3-2x^2y+xy-1),
|X-2|+(y+4分之1)^2=0
则x-2=0 x=2
y+1/4=0 y=-1/4
x^2(x^2-xy+y)-x*(x^3-2x^2y+xy-1)
=x^4-x^3y+x^2y-x^4+2x^3y-x^2y+x
=x^3y+x
=2^3*(-1/4)+2
=-2+2
=0
已知:xy^2=-2,求-xy(x^3y^7-3x^2y^5-y)的值
-xy(x^3y^7-3x^2y^5-y)
=-x^4y^8+3x^3y^6+xy^2
=-(xy^2)^4+3(xy^2)^3+xy^2
=-(-2)^4+3×(-2)^3-2
=-16-24-2
=-42