Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 8: ( √ 28 -2 √3 + √7) √7 + √84 Tính nhá giúppp

Toán Lớp 8: ( √ 28 -2 √3 + √7) √7 + √84
Tính nhá giúppp

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    (\sqrt{28} – 2\sqrt{3} + \sqrt{7}) . \sqrt{7} + \sqrt{84}
    = (\sqrt{4 . 7} – 2\sqrt{3} + \sqrt{7}) . \sqrt{7} + \sqrt{4 . 21}
    = (2\sqrt{7} – 2\sqrt{3} + \sqrt{7}) . \sqrt{7} + 2\sqrt{21}
    = (3\sqrt{7} – 2\sqrt{3}) .\sqrt{7} + 2\sqrt{21}
    = 3\sqrt{7} . \sqrt{7} – 2\sqrt{3} . \sqrt{7} + 2\sqrt{21}
    = 3 . 7 – 2\sqrt{21} + 2\sqrt{21}
    = 21

Leave a reply

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

About Lan Lan