已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值合并同类项:2x²-5x+x²+4-3x²-7x²y-5xy²-4x²y+3xy²化简:(1)5a-2a= (2)-2a²b+1/2a²b= (3)-xy-5xy+6yx=

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已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值合并同类项:2x²-5x+x²+4-3x²-7x²y-5xy²-4x²y+3

已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值合并同类项:2x²-5x+x²+4-3x²-7x²y-5xy²-4x²y+3xy²化简:(1)5a-2a= (2)-2a²b+1/2a²b= (3)-xy-5xy+6yx=
已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值
合并同类项:
2x²-5x+x²+4-3x²
-7x²y-5xy²-4x²y+3xy²
化简:
(1)5a-2a=
(2)-2a²b+1/2a²b=
(3)-xy-5xy+6yx=

已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值合并同类项:2x²-5x+x²+4-3x²-7x²y-5xy²-4x²y+3xy²化简:(1)5a-2a= (2)-2a²b+1/2a²b= (3)-xy-5xy+6yx=
已知x=7/3,y=1/8,求2x-3y-4+7y-5x+3的值
2x-3y-4+7y-5x+3
=4y-3x-1
=4×1/8-3×7/3-1
=1/2-7-1
=-15/2
合并同类项:
2x²-5x+x²+4-3x²
=4-5x
-7x²y-5xy²-4x²y+3xy²
=-11x²y-2xy²
化简:
(1)5a-2a=3a
(2)-2a²b+1/2a²b=-3/2a²b
(3)-xy-5xy+6yx=0