去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4

来源：学生作业帮编辑：百度作业网作业帮分类：数学作业时间：2024/07/16 04:36:14

去括号并化简
1.4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
2.(3a³-2a²+5a+7)+(-2a²-½a+3)-(-4a³+½a²+6a-5)

4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
解:原式= 4xy²-3x²y-{3x²y+xy²-2xy²+4x²y-x²y+2xy²}
=4xy²-3x²y-3x²y-xy²+2xy²-4x²y+x²y-2xy²
=3xy²-9x²y

去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4 化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1, 去括号：1/2（2X²Y-3XY²+4XY-X²Y²）=? 先去括号,再合并同类项：3x²y-[2xy²-2（xy-2/3x²y）+xy]+3xy&# 代数式去括号并合拼同类项“3x²y+xy²-【2xy²-4x²+(x² -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 3x²y+xy²-[2xy²-4x²y+（x²y-2xy²）化简求值3x²y-[2xy-2（xy-3/2x²y)+xy]+3xy²其中x=3、y=-1 (2x²y-3xy²)-3(x²y-2xy²)+2（x²y-4xy&# 计算：(xy-x²)×x-y/xy 计算 2xy[4x²y²-3y（xy+x²y）-xy²] 化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x