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

Toán Lớp 9: Căn28 cộng 2căn63 trừ 5căn18 cộng căn72

Toán Lớp 9: Căn28 cộng 2căn63 trừ 5căn18 cộng căn72

Comments ( 2 )

  1. mik làm ở dưới nhé 
     

    toan-lop-9-can28-cong-2can63-tru-5can18-cong-can72

  2. $\sqrt{28}$ + 2$\sqrt{63}$ -5$\sqrt{18}$ + $\sqrt{72}$ 
    = 2$\sqrt{7}$+2.3$\sqrt{7}$-5.3$\sqrt{2}$+6$\sqrt{2}$
    =2$\sqrt{7}$+6$\sqrt{7}$-15$\sqrt{2}$+6$\sqrt{2}$
    =8$\sqrt{7}$-9$\sqrt{2}$
     

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