化简(1)(4x2y﹣3xy2)﹣(1+4x2y﹣3xy2)(2)3(4x2﹣3x+2)﹣2(1﹣4x2+x)(3)4y2﹣[3y﹣(3﹣2y)+2y2]
题型:解答题难度:一般来源:期中题
化简(1)(4x2y﹣3xy2)﹣(1+4x2y﹣3xy2) (2)3(4x2﹣3x+2)﹣2(1﹣4x2+x) (3)4y2﹣[3y﹣(3﹣2y)+2y2] |
答案
解:(1)原式=4x2y﹣3xy2﹣1﹣4x2y+3xy2 =(4﹣4)x2y+(﹣3+3)xy2﹣1 =﹣1; (2)原式=12x2﹣9x+6﹣2+8x2﹣2x =(12+8)x2+(﹣9﹣2)x+(6﹣2) =20x2﹣11x+4; (3)原式=4y2﹣[3y﹣3+2y+2y2] =4y2﹣3y+3﹣2y﹣2y2 =(4﹣2)y2+(﹣3﹣2)y+3 =2y2﹣5y+3. |
举一反三
先化简,再求值:﹣(2x﹣3y2)+(2x﹣2y2)﹣1,其中. |
若整式M,N满足式子M+N=x2﹣3,其中M=3x﹣3,求N. |
xy-xy+1 |
化简: (1)2a﹣5b﹣3a+b; (2)﹣2(2x2﹣xy)+4(x2+xy﹣1). |
最新试题
热门考点