先去括号,再合并同类项:①(8x-5y)-(4x-9y) ②x-(2x-y)+(3x-2y) ③先去括号,再合并同类项:①(8x-5y)-(4x-9y)②x-(2x-y)+(3x-2y)③2(x+y)+(-5x+2y)④-2(-3xy+2z)+3(-2xy-5x)

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先去括号,再合并同类项:①(8x-5y)-(4x-9y)②x-(2x-y)+(3x-2y)③先去括号,再合并同类项:①(8x-5y)-(4x-9y)②x-(2x-y)+(3x-2y)③2(x+y)+(

先去括号,再合并同类项:①(8x-5y)-(4x-9y) ②x-(2x-y)+(3x-2y) ③先去括号,再合并同类项:①(8x-5y)-(4x-9y)②x-(2x-y)+(3x-2y)③2(x+y)+(-5x+2y)④-2(-3xy+2z)+3(-2xy-5x)
先去括号,再合并同类项:①(8x-5y)-(4x-9y) ②x-(2x-y)+(3x-2y) ③
先去括号,再合并同类项:
①(8x-5y)-(4x-9y)
②x-(2x-y)+(3x-2y)
③2(x+y)+(-5x+2y)
④-2(-3xy+2z)+3(-2xy-5x)

先去括号,再合并同类项:①(8x-5y)-(4x-9y) ②x-(2x-y)+(3x-2y) ③先去括号,再合并同类项:①(8x-5y)-(4x-9y)②x-(2x-y)+(3x-2y)③2(x+y)+(-5x+2y)④-2(-3xy+2z)+3(-2xy-5x)