2xy-{5x-3[xy-1/3x(y+1)]-4xy} 去掉括号,并合并.

分类: 作业答案 • 2021-12-18 22:27:30

问题描述：

答

2xy-{5x-3[xy-1/3x(y+1)]-4xy}
=2xy-{5x-3[xy-1/3*xy-1/3*x-4xy}
=2xy-[5x-3xy+1/3*xy+1/3*x+4xy]
=2xy-5x+3xy-1/3*xy-1/3*x-4xy
=2/3*xy-16/3*x

答

2xy-{5x-3[xy-1/3x(y+1)]-4xy}
=2 xy - {5 x+ x + 3 xy + x y - 4 xy}
=-6 x + 3 xy - x y