3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/28 16:05:00
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
=3x²y-(2x²y-6xy+6x²y-xy)
=3x²y-(8x²y-7xy)
=3x²y-8x²y+7xy
=-5x²y+7xy
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来源:学生作业帮助网 编辑:作业帮 时间:2024/05/28 16:05:00
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
=3x²y-(2x²y-6xy+6x²y-xy)
=3x²y-(8x²y-7xy)
=3x²y-8x²y+7xy
=-5x²y+7xy