去括号:(1)a-(b+c-3)=______;(2)x+(5-3y)=______.
题型:填空题难度:一般来源:不详
去括号: (1)a-(b+c-3)=______; (2)x+(5-3y)=______. |
答案
(1)a-(b+c-3) =a-b-c+3,
(2)x+(5-3y) =x+5-3y, 故答案为:a-b-c+3.x+5-3y. |
举一反三
(a-b+c-d)(a+b-c-d)=[(a-d)-______][(a-d)+______] |
下列各组式子中,是同类项的是( )A.3xy与-2yx | B.3x2y与-3xy2 | C.2x与2x2 | D.5xy与5yz |
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若3x4yn-2与-5xm+2y2n-8是同类项,则=______. |
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