问题标题:
去括号2(a-b)-3(c+d)-5/2(m-n)+1/3(c+d)去括号并合并同类项:(8x-5y)-(4x-9y)去括号并合并同类项:x-(2x-y)+(3x-2y)2(x+y)+(-5x+2y)-2(-3xy+2z)+3(-2xy-5x)
问题描述:
去括号2(a-b)-3(c+d)-5/2(m-n)+1/3(c+d)去括号并合并同类项:(8x-5y)-(4x-9y)
去括号并合并同类项:x-(2x-y)+(3x-2y)2(x+y)+(-5x+2y)-2(-3xy+2z)+3(-2xy-5x)
马玉新回答:
2(a-b)-3(c+d)
=2a-2b-3c-3d
-5/2(m-n)+1/3(c+d)
=-5/2m-5/2n+1/3c+1/3d
(8x-5y)-(4x-9y)
=8x-5y-4x+9y
=4x+4y
x-(2x-y)+(3x-2y)
=x-2x+y+3x-2y
=2x-y
2(x+y)+(-5x+2y)
=2x+2y-5x+2y
=-3x+4y
-2(-3xy+2z)+3(-2xy-5x)
=6xy-4z-6xy+15x
=15x-4z
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