计算2m/5n²p-3n/4mp²还有两题：3y/2x+2y+2xy/x²+xy2x/x²-64y²-1/x-8y就这三题，做起来有很多疑问。

计算2m/5n²p-3n/4mp²还有两题：3y/2x+2y+2xy/x²+xy2x/x²-64y²-1/x-8y就这三题，做起来有很多疑问。
计算2m/5n²p-3n/4mp²
还有两题：3y/2x+2y+2xy/x²+xy
2x/x²-64y²-1/x-8y
就这三题，做起来有很多疑问。

计算2m/5n²p-3n/4mp²还有两题：3y/2x+2y+2xy/x²+xy2x/x²-64y²-1/x-8y就这三题，做起来有很多疑问。
2m/5n²p-3n/4mp²
=(8m²p-15n³)/20mn²p²
3y/2x+2y+2xy/x²+xy
=3y/2(x+y)+2xy/x(x+y)
=3y/2(x+y)+2y/(x+y)
=(3y+4y)/2(x+y)
=7y/(2x+2y)
2x/x²-64y²-1/x-8y
=2x/(x-8y)(x+8y)-1/(x-8y)
=(2x-x-8y)/(x-8y)(x+8y)
=(x-8y)/(x-8y)(x+8y)
=1/(x+8y)