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(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy

来源:学生作业帮 编辑:神马作文网作业帮 分类:综合作业 时间:2024/11/20 03:10:59
(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
=(x-y)分之x-(x+y)分之y+(x-y)(x+y)分之2xy
=(x-y)(x+y)分之[x(x+y)-y(x-y)+2xy]
=(x-y)(x+y)分之(x平方+2xy+y平方)
=(x-y)(x+y)分之(x+y)平方
=(x-y)分之(x+y)