帮个忙 计算题(6 x^2y -4 xy ^2)/2xy(-3/4x)(8x^2-4)[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3[(1/2x加y)^2-(1/2x-y)^2]/(-4xy)谢
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帮个忙 计算题(6 x^2y -4 xy ^2)/2xy(-3/4x)(8x^2-4)[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3[(1/2x加y)^2-(1/2x-y)^2]/(-4xy)谢
帮个忙 计算题
(6 x^2y -4 xy ^2)/2xy
(-3/4x)(8x^2-4)
[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3
[(1/2x加y)^2-(1/2x-y)^2]/(-4xy)
谢
帮个忙 计算题(6 x^2y -4 xy ^2)/2xy(-3/4x)(8x^2-4)[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3[(1/2x加y)^2-(1/2x-y)^2]/(-4xy)谢
(6 x^2y -4 xy ^2)/2xy
解,得:
==2xy(3 x-2y )/2xy
==3x-2y
(-3/4x)(8x^2-4)
解,得:
==(-3/4x)*4*(2x^2-1)
==(-3/x)*2x^2+(3/x)
==-6x+3/x
==-3(3x+1/x)
==-3(3x^2+1)/x
[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3
解,得:
==[4a^2b^2(3b^2-5ab)+8a^2b^3]/8a^2b^3
==4a^2b^2(3b^2-5ab+2b)/8a^2b^3
==4a^2b^3(3b-5a+2)/8a^2b^3
==(3b-5a+2)/2
[(1/2x+y)^2-(1/2x-y)^2]/(-4xy)
解,得:
==[(1/2x+y)+(1/2x-y)]*[(1/2x+y)-(1/2x-y)]*(-1/4xy)
==(1/2x+y+1/2x-y)*(1/2x+y-1/2x+y)*(-1/4xy)
==(1/x)*(2y)*(-1/4xy)
==-1/2x^2