计算(1)a-1/3y(a+b)+1/2(a-b)-1/6(a-2b) (2)x(9x-5)-(3x+1)(3x-1)(3)4xy+(x-2y)^2+(x+3y)(3y-x)
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计算(1)a-1/3y(a+b)+1/2(a-b)-1/6(a-2b)(2)x(9x-5)-(3x+1)(3x-1)(3)4xy+(x-2y)^2+(x+3y)(3y-x)计算(1)a-1/3y(a+
计算(1)a-1/3y(a+b)+1/2(a-b)-1/6(a-2b) (2)x(9x-5)-(3x+1)(3x-1)(3)4xy+(x-2y)^2+(x+3y)(3y-x)
计算(1)a-1/3y(a+b)+1/2(a-b)-1/6(a-2b) (2)x(9x-5)-(3x+1)(3x-1)
(3)4xy+(x-2y)^2+(x+3y)(3y-x)
计算(1)a-1/3y(a+b)+1/2(a-b)-1/6(a-2b) (2)x(9x-5)-(3x+1)(3x-1)(3)4xy+(x-2y)^2+(x+3y)(3y-x)
(1)a-1/3 (a+b)+1/2(a-b)-1/6(a-2b) 删除了一个y
=a-a/3-b/3+a/2-b/2-a/6+b/3
=a-b/2
(2)x(9x-5)-(3x+1)(3x-1)
=9x²-5x-9x²+1
=-5x+1
(3)4xy+(x-2y)^2+(x+3y)(3y-x)
=4xy+x²-4xy+4y²+9y²-x²
=13y²
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
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