\(\left(3^{15}+3^{16}+3^{17}\right):\left(3^{11}+3^{12}+3^{13}\right)=3^4.\left(3^{11}+3^{12}+3^{13}\right):\left(3^{11}+3^{12}+3^{13}\right)=3^4=81\)

\(\left(3^{15}+3^{16}+3^{17}\right):\left(3^{11}+3^{12}+3^{13}\right)\)

\(=3^4\left(3^{11}+3^{12}+3^{13}\right):\left(3^{11}+3^{12}+3^{13}\right)\)

\(=3^4=81\)

(3¹⁵+3¹⁶+3¹⁷) : (3¹¹+3¹²+3¹³)

=3⁴(3¹¹+3¹²+3¹³) : (3¹¹+3¹²+3¹³)

=3⁴=81

a) 2 nhân 7 mũ 2 - 16 nhân 2 mũ 3 

=          98           -       128 

=                - 30 

2.7^2-16.2^3

= 2.49-16.8

= 98 - 128

= -30

b) 17 nhân 120 + 17 nhân ( -20 )

=        2040       + 17 nhân 20

=        2040       +    340

=                    2380

15^3+5.15^2-5^3 / 18^3+6.18^2-6^3

=3375+5.225-125 /5832+6.324-216

=3375+1125-125 /5832+1944-216

=4500-125 /7826-216

=4375 /7610

=875 /1522

mk ko bt viết phần nên viết phần bằng dấu gạch / nhé.mk cx ko bt đúng hay sai đâu nhé

\(125.\left(28+72\right)-25.\left(3^2.4+64\right)\)

\(=125.100-25.\left(9.4+64\right)\)

\(=125.100-25.\left(36+64\right)\)

\(=125.100-25.100\)

\(=100.\left(125-25\right)\)

\(=100.100\)

\(=10000\)

125.(28+72)-25.(3^2.4+64)

=125.100-25.(9.4+64)

=125.100-25.(36+64)

=125.100-25.100

=100.(125-25)

=100.100

=100^2

=10 000

a) \(\dfrac{28}{11}\cdot\dfrac{21}{22}\cdot9\)

\(=\dfrac{28\cdot21}{11\cdot22}\cdot9\)

\(=\dfrac{14\cdot21}{11\cdot11}\cdot9\)

\(=\dfrac{294}{121}\cdot9\)

\(=\dfrac{2646}{121}\)

(16³-64²):8

=(4096-4096):8

=0:8

=0

= (16+64)(16-64)

-4800