Question

thực hiện phép tính

a) 81^11.3^17/27^10.9^15

b) A=2^12.3^5-4^6.9^2/(2^2.3^6)+8^4.3^5-5^10.7^3-25^5.49^2/(125.7)^3+5^9

giúp mình vowisddang cần gấp. cảm ơn

Answer 1

a) 81^11.3^17/27^10.9^15

=(9^2)^11.3^17/(3^3)^10.9^15

=3^44.3^17/3^30.3^30

=3^61/3^60

=3

b) A =( (2^12.3^5 - 2^12.3^4)/ (2^12.3^6 + 2^12.3^5) ) - ((5^10.7^3 - 5^10.7^4)/(5^9.7^3 + 5^9.2^3.7^3))

=(2^12.3^4(3-1))/2^12.3^5(3+1) - 5^10.7^3(1-7)/5^9.7^3(1+8)

=2/12- (-30/9)=1/6 + 10/3 = 7/2

Answer 2

3/6, /8,4/6

Answer 3

\left(4\dfrac{4}{9} + 5\dfrac{4}{11}\right) -1\dfrac{4}{9} =(494​+5114​)−194​