作业帮(4x^3-x^2+5)+(5x^2-x^3-4),其中x=-2 .（xy-2/3y-2/3）-（1/2x-1/2xy+1）,其中x=2/3,y=3/4.
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(4x^3-x^2+5)+(5x^2-x^3-4),其中x=-2 .（xy-2/3y-2/3）-（1/2x-1/2xy+1）,其中x=2/3,y=3/4.
(4x^3-x^2+5)+(5x^2-x^3-4),其中x=-2 .（xy-2/3y-2/3）-（1/2x-1/2xy+1）,其中x=2/3,y=3/4.
(4x^3-x^2+5)+(5x^2-x^3-4),其中x=-2 .（xy-2/3y-2/3）-（1/2x-1/2xy+1）,其中x=2/3,y=3/4.
(4x^3-x^2+5)+(5x^2-x^3-4)=3x^3+4x^2+1
当x=2时,带入原等式=3*2^3+4*2^2=3*8+4*4= 40;
（xy-2/3y-2/3）-（1/2x-1/2xy+1)=xy-2/3y-2/3-1/2x+1/2xy-1
=3/2xy-2/3y-1/2x-5/3
当x=2/3,y=3/4,代入原等式=3/2*2/3*3/4-2/3*3/4-1/2*2/3-5/3
=3/4-1/2-1/3-5/3
=-7/4
(4x^3-x^2+5)+(5x^2-x^3-4)=3x^3+4x^2+1=3×（-2）^3+4×(-2)^2+1=3×(-8)+4×4+1=-24+16+1=-7
？？问题
(4x^3-x^2+5)+(5x^2-x^3-4)=3x^3+4x^2+1
当x=2时，带入原等式=3*2^3+4*2^2=3*8+4*4=40
（xy-2/3y-2/3）-（1/2x-1/2xy+1)
=xy-2/3y-2/3-1/2x+1/2xy-1
=3/2xy-2/3y-1/2x-5/3
当x=2/3，y=3/4，
原式=3/2*2/3*3/4-2/3*3/4-1/2*2/3-5/3
=3/4-1/2-1/3-5/3
=-7/4
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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