(______)-(-5x)=4x2-3x+2;2a2-5ab+4b2-(______)=a2-3ab.
题型:填空题难度:一般来源:不详
(______)-(-5x)=4x2-3x+2;2a2-5ab+4b2-(______)=a2-3ab. |
答案
设M-(-5x)=4x2-3x+2, 则M=4x2-3x+2-5x=4x2-8x+2. 设2a2-5ab+4b2-N=a2-3ab, 则N=2a2-5ab+4b2-a2+3ab=a2-2ab+4b2. 故答案为:4x2-8x+2、a2-2ab+4b2. |
举一反三
1-2a+a2=-(______)=1+(______). |
去括号7x3-[3x2-(x+1)]=______. |
已知15x2y与-xmyn与是同类项,则|-2m+n|+|m-3n|的值是______. |
下列各式中是同类项的是( )A.3x2y与3xy2 | B.-ab与abc | C.3x2与-3y2 | D.-a2b3c与0.5a2b3c |
|
若14x5y2和-31x3my2的和是单项式,则式子12m-24的值是( ) |
最新试题
热门考点