[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值
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[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值[6xy-3(xy-1/
[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值
[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值
[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值
[6xy-3(xy-1/2x2y)]÷3xy
=(6xy-3xy+3/2x^2y)÷3xy
=(3xy+3/2x^2y)/3xy
=1+x/2
将x=2008代入得
1+2008/2=1+1004=1005
3(xy-1/2x2y)]是什么意思？？
[6xy-3(xy-1/2x2y)]÷3xy
=(6xy-3xy+3/2x^2y)÷3xy
=(3xy+3/2x^2y)/3xy
=1+x/2
原式=8xy-6xy+8xy-4+2xy+1=12xy-3 将x=-1/2,y=2代入得12*(-1/2)*2-3=-15 12xy-3, -15
[6xy-3(xy-1/2x2y)]÷3xy,其中x=2008,y=2009先化简再求值
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