化简:(1)8a+2b+(5a-b);(2)(8xy-x2+y2)-3(-x2+y2+5xy).
题型:解答题难度:一般来源:不详
化简: (1)8a+2b+(5a-b); (2)(8xy-x2+y2)-3(-x2+y2+5xy). |
答案
(1)8a+2b+(5a-b) =8a+5a+2b-b =13a+b;
(2)8xy-x2+y2+3x2-3y2-15xy=2x2-7xy-2y2. |
举一反三
化简:(x2+y2)+(2y2-x2)=______. |
若x2=2-xy,y2=1-xy,则x2-y2的值为______. |
化简: (1)3a2-2a+4a2-7a; (2)a+(5a-3b)-(a-2b). |
当a-b=-1,ab=-2时,(2a-3b-ab)-(a-2b+3ab)=______. |
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