matlab >> syms r x>> limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r ,inf)ans =limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r = inf)应该可以求
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![matlab >> syms r x>> limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r ,inf)ans =limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r = inf)应该可以求](/uploads/image/z/6753563-35-3.jpg?t=matlab+%3E%3E+syms+r+x%3E%3E+limit%28-1%2F216%2Aa%2A%2836%2Ar%5E3%2Aexp%28-6%2Ar%2Fa%29%2B18%2Ar%5E2%2Aexp%28-6%2Ar%2Fa%29%2Aa%2B6%2Ar%2Aexp%28-6%2Ar%2Fa%29%2Aa%5E2%2Bexp%28-6%2Ar%2Fa%29%2Aa%5E3-a%5E3%29%2Cr+%2Cinf%29ans+%3Dlimit%28-1%2F216%2Aa%2A%2836%2Ar%5E3%2Aexp%28-6%2Ar%2Fa%29%2B18%2Ar%5E2%2Aexp%28-6%2Ar%2Fa%29%2Aa%2B6%2Ar%2Aexp%28-6%2Ar%2Fa%29%2Aa%5E2%2Bexp%28-6%2Ar%2Fa%29%2Aa%5E3-a%5E3%29%2Cr+%3D+inf%29%E5%BA%94%E8%AF%A5%E5%8F%AF%E4%BB%A5%E6%B1%82)
matlab >> syms r x>> limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r ,inf)ans =limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r = inf)应该可以求
matlab
>> syms r x
>> limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r ,inf)
ans =
limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r = inf)
应该可以求出等于1/216*a^4的简单形式啊,怎么让它输出这个形式呢?
matlab >> syms r x>> limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r ,inf)ans =limit(-1/216*a*(36*r^3*exp(-6*r/a)+18*r^2*exp(-6*r/a)*a+6*r*exp(-6*r/a)*a^2+exp(-6*r/a)*a^3-a^3),r = inf)应该可以求
这个东西是数学软件的了,不太会,建议你咨询一些在这方面比较出名的人物,实在是很抱歉,