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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: rút gọn (a- √a/ √a-1- √a+1/a+ √a) : √a+1/a làm hộ mình hay n+5*

Toán Lớp 9: rút gọn
(a- √a/ √a-1- √a+1/a+ √a) : √a+1/a
làm hộ mình hay n+5*

Comments ( 2 )

  1. ((a-\sqrt{a})/(\sqrt{a}-1)-(\sqrt{a}+1)/(a+\sqrt{a})):(\sqrt{a}+1)/(a) (a>0,ane1)
    =((\sqrt{a}(\sqrt{a}-1))/(\sqrt{a}-1)-(\sqrt{a}+1)/(\sqrt{a}(\sqrt{a}+1))).(a)/(\sqrt{a}+1)
    =(\sqrt{a}-1/(\sqrt{a})).(a)/(\sqrt{a}+1)
    =(a-1)/(\sqrt{a}).(a)/(\sqrt{a}+1)
    =((\sqrt{a}-1)(\sqrt{a}+1))/(\sqrt{a}).(a)/(\sqrt{a}+1)
    =\sqrt{a}(\sqrt{a}-1)
    =a-\sqrt{a}
     

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222-9+11+12:2*14+14 = ? ( )