几道计算题目,麻烦帮忙详细计算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/30 17:40:00
几道计算题目,麻烦帮忙详细计算
(1)(x/y²)*(3y³/2x²)
(2)(-2x/y)³
(3)(12/m²-9)+(2/m+3)
(1)(x/y²)*(3y³/2x²)
(2)(-2x/y)³
(3)(12/m²-9)+(2/m+3)
![几道计算题目,麻烦帮忙详细计算](/uploads/image/z/5425250-50-0.jpg?t=%E5%87%A0%E9%81%93%E8%AE%A1%E7%AE%97%E9%A2%98%E7%9B%AE%2C%E9%BA%BB%E7%83%A6%E5%B8%AE%E5%BF%99%E8%AF%A6%E7%BB%86%E8%AE%A1%E7%AE%97)
(1)(x/y²)*(3y³/2x²)
=(3y)/(2x)
(2)(-2x/y)³
=(-8x³)/y³
(3)(12/(m²-9))+(2/(m+3))
=(12/((m+3)(m-3))+2/(m+3)
=(2/(m+3))*(6/(m-3)+1)
=(2/(m+3))*((6+m-3)/(m-3))
=(2/(m+3))*((m+3)/(m-3))
=2/(m-3)
=(3y)/(2x)
(2)(-2x/y)³
=(-8x³)/y³
(3)(12/(m²-9))+(2/(m+3))
=(12/((m+3)(m-3))+2/(m+3)
=(2/(m+3))*(6/(m-3)+1)
=(2/(m+3))*((6+m-3)/(m-3))
=(2/(m+3))*((m+3)/(m-3))
=2/(m-3)