去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x²+x_其他解答

去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x²+xy²-[2xy²-4x²y+(x²y-2xy²)]}

人气：219 ℃　时间：2020-03-29 16:55:48

解答

4x-3y-[-3+x+x-y]-5x =4x-3y+3-2x+y-5x=-3x-2y+3去括号先从里面去后依次向外一样的要合并4xy²-3x²y-{3x²+xy²-[2xy²-4x²y+(x²y-2xy²)]}=4xy²-3x²y-3x²-xy&...