求多项式2a2-4a-1与多项式-3a2+2a-5的差.
题型:解答题难度:一般来源:不详
求多项式2a2-4a-1与多项式-3a2+2a-5的差. |
答案
(2a2-4a-1)-(-3a2+2a-5) =2a2-4a-1+3a2-2a+5 =5a2-6a+4. |
举一反三
化简: (1)2xy-x3+2xy+0.5x3+; (2)(3mn-5m2)-(3m2-5mn); (3)2a+2(a+1)-3(a-1). |
化简: ①(8a-7b)-(4a-5b); ②5xyz-2x2y+[3xyz-(4xy2-x2y)]; ③先化简,再求值:-3(2m+3n)-(6n-12m),其中m=5,n=-1. |
化简: (1)5x-(3x-2y); (2)7x-[-2x-(8x-1)]. |
若A+(3x2-y2)=4x2-xy+y2,则A等于( )A.7x2+xy+2y2 | B.x2+xy+2y2 | C.7x2-xy+2y2 | D.x2-xy+2y2 |
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化简求值:7a2b+2(2a2b-3ab2)-3(4a2b-ab2),其中a=-2、b=3. |
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