(a^2-2a)/(a^2+2a)*(a+2)/(a-1)-(2a-1)(2-a)/(a^2-4)÷(a^2+a-2)(a^2+4a+4)急求呀!大神求解!
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(a^2-2a)/(a^2+2a)*(a+2)/(a-1)-(2a-1)(2-a)/(a^2-4)÷(a^2+a-2)(a^2+4a+4)急求呀!大神求解!
(a^2-2a)/(a^2+2a)*(a+2)/(a-1)-(2a-1)(2-a)/(a^2-4)÷(a^2+a-2)(a^2+4a+4)
急求呀!大神求解!
(a^2-2a)/(a^2+2a)*(a+2)/(a-1)-(2a-1)(2-a)/(a^2-4)÷(a^2+a-2)(a^2+4a+4)急求呀!大神求解!
>> syms a
>> (a^2-2*a)/(a^2+2*a)*(a+2)/(a-1)-(2*a-1)*(2-a)/(a^2-4)/(a^2+a-2)*(a^2+4*a+4)
ans =
((2*a - 1)*(a - 2)*(a^2 + 4*a + 4))/((a^2 - 4)*(a^2 + a - 2)) - ((- a^2 + 2*a)*(a + 2))/((a - 1)*(a^2 + 2*a))
>> simplify(ans)
ans =
3
用matlab算的,应该不会错的.
不过这个式子你分母分子同时因式分解,很好约分的啊.
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