去括号、合并同类项去括号5c²-(a²-b²-ab)-m+(-n+p-q)xy-(-2x²-y²+z²)-(2x-y)+(z-1)先去括号,再合并同类项5a+(2a-4b)2x²-3(2x²-x²)去括号5x²-[3x-2(2x-3)-4x²]
问题描述:
去括号、合并同类项
去括号
5c²-(a²-b²-ab)
-m+(-n+p-q)
xy-(-2x²-y²+z²)
-(2x-y)+(z-1)
先去括号,再合并同类项
5a+(2a-4b)
2x²-3(2x²-x²)
去括号
5x²-[3x-2(2x-3)-4x²]
答
-
5c²-a²-b²+ab
-m-n+p-q
xy+2x²+y²-z²
-2x+y+z-1
-
5a+2a-4b=7a-4b
2x²-6x²+3x²=-x²
-
5x²-(3x-4x+6-4x²)=5x²+x-6+4x²=9x²+x-6
答
去括号5c²-(a²-b²-ab)=5c²-a²+b²+ab-m+(-n+p-q)=-m-n+p-qxy-(-2x²-y²+z²)=xy+2x²+y²-z²-(2x-y)+(z-1)=-2x+y+z-1先去括号,再合并同类项5a+(2a-4b)...