(1)(-8xy+5y²)-5xy(2)(3x+y)-2(2x-y)(3)-2(x-三分之一y²)+3(二分之一x+九分之一y²)
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(1)(-8xy+5y²)-5xy(2)(3x+y)-2(2x-y)(3)-2(x-三分之一y²)+3(二分之一x+九分之一y²)
(1)(-8xy+5y²)-5xy
(2)(3x+y)-2(2x-y)
(3)-2(x-三分之一y²)+3(二分之一x+九分之一y²)
(1)(-8xy+5y²)-5xy(2)(3x+y)-2(2x-y)(3)-2(x-三分之一y²)+3(二分之一x+九分之一y²)
1 =-13xy+5y²
2 =3x+y-4x+2y=-x+3y
3 =-2x+2/3y²+3/2x+1/3y²=-1/2x+y²
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(1)(-8xy+5y²)-5xy =-8xy+5y²-5xy =(-8-5)xy+5y² =-13xy+5y² (2) (3x+y)-2(2x-y) =(3-4)x+(1+2)y =-x+3y (3) -2(x-三分之一y²)+3(二分之一x+九分之一y²) =-2x+三分之二y²+二分之三x+三分之一y² =(2+二分之三)x+(三分之二+三分之一)y² =二又三分之二x+y² 望采纳!
=3x+y-4x+2y