去括号:a+(b+c)=______;a+(-b+c)=______;a-(-b+c)=______;a-(-b-c)=______;2a+3(b-c)=___
题型:填空题难度:一般来源:不详
去括号: a+(b+c)=______; a+(-b+c)=______; a-(-b+c)=______; a-(-b-c)=______; 2a+3(b-c)=______; 2a-3(b-4c)=______. |
答案
a+(b+c)=a+b+c; a+(-b+c)=a-b+c; a-(-b+c)=a+b-c; a-(-b-c)=a+b+c; 2a+3(b-c)=2a+3b-3c; 2a-3(b-4c)=2a-3b+12c. 故答案为:a+b+c;a-b+c;a+b-c;a+b+c;2a+3b-3c;2a-3b+12c. |
举一反三
若-3x3y2m与2xny4是同类项,则|m-n|的结果是( ) |
下列去括号正确的是( )A.3x+(5-2x)=3x+5+2x | B.-(x-6)=-x-6 | C.7x-(x+1)=7x-x-1 | D.3(x+8)=3x+8 |
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若-3xmy5与0.4x3y2n+1是同类项,则m+n=______. |
已知2xby3a与-3x2ay5-b是同类项,则a=______,b=______. |
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