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

来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/16 11:25:25
去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x²+xy²-[2xy²-4x²y+(x²y-2xy²)]}
去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x
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-xy²+[2xy²-4x²y+(x²y-2xy²)]}
=4xy²-3x²y-3x²-xy²+2xy²-4x²y+x²y-2xy²
=3xy²-6x²y-3x²