计算:(2xy-y)-(-y+xy)=______.
题型:填空题难度:一般来源:宁夏
计算:(2xy-y)-(-y+xy)=______. |
答案
(2xy-y)-(-y+xy) =2xy-y+y-xy =xy |
举一反三
(2a+3b)2=(2a-3b)2+( ),括号内的式子是( ) |
一个多项式减去x2-2y2等于x2+y2,则这个多项式是( )A.-2x2+y2 | B.2x2-y2 | C.x2-2y2 | D.-x2+2y2 |
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计算:-xy-[2x2+y2-2(x2-xy+y2)]. |
化简求值:3x3-2x2-[7-2x-(-x2-3x3)],其中x=-. |
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