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

Toán Lớp 7: Tính a) ( 9^5 – 27^3 ) : 3^8 b) 35 x (

Toán Lớp 7: Tính a) ( 9^5 – 27^3 ) : 3^8
b) 35 x ( 3 x 7^15 – 11 x 7^14 ) / 7^16 + 3 x 7^15

Comments ( 2 )

  1. a) ($9^{5}$ – 27³) : $3^{8}$
    =  ($3^{10}$ – $3^{9}$) : $3^{8}$
    = $3^{9}$ (3 – 1) : $3^{8}$
    = 3 . 2
    = 6
    b) $\frac{35 . (3 . 7^{15} – 11 . 7^{14})}{7^{16} + 3 . 7^{15}}$ 
    = $\frac{5 . 7 . 7^{14} . (21 – 11)}{7^{15} . (7 + 3)}$
    = $\frac{5 . 7^{15} . 10}{7^{15} . 10}$
    = 5

  2. a) ( 9^5 – 27^3 ) : 3^8
    =(3^10-3^9):3^8
    =3^10 : 3^8 – 3^9 : 3^8
    =3^2 – 3=9-3=6
    b) (35 × ( 3 × 7^15 – 11 × 7^14 )) / (7^16 + 3 × 7^15)
    =(5×7 × 7^14×(3×7-11)) / (7^15×(7+3)
    =(5× 7^15×10) / (7^15×10)
     =5

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

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