1.计算(1/2x)^2*(-4y^2)+(1/2xy)^2 2.-1/3xy[6xy-3(xy-1/2x^2y) ] 现在就要,第一题:计算(1/2x)^2*(-4y^2)+(1/2xy)^2 第二题:-1/3xy[6xy-3(xy-1/2x^2y) ]
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1.计算(1/2x)^2*(-4y^2)+(1/2xy)^2 2.-1/3xy[6xy-3(xy-1/2x^2y) ] 现在就要,第一题:计算(1/2x)^2*(-4y^2)+(1/2xy)^2 第二题:-1/3xy[6xy-3(xy-1/2x^2y) ]
1.计算(1/2x)^2*(-4y^2)+(1/2xy)^2 2.-1/3xy[6xy-3(xy-1/2x^2y) ]
现在就要,
第一题:计算(1/2x)^2*(-4y^2)+(1/2xy)^2
第二题:-1/3xy[6xy-3(xy-1/2x^2y) ]
1.计算(1/2x)^2*(-4y^2)+(1/2xy)^2 2.-1/3xy[6xy-3(xy-1/2x^2y) ] 现在就要,第一题:计算(1/2x)^2*(-4y^2)+(1/2xy)^2 第二题:-1/3xy[6xy-3(xy-1/2x^2y) ]
(1/2x)²*(-4y²)+(1/2xy)²
= -2x²y²+(1/2xy)²
=(-3/2)(xy)²
-1/3xy[6xy-3(xy-1/2x²y) ]
= -1/3xy(3xy+3/2x²y)
= -x²y²-1/2x^3y²
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