If (9 ^ m + 3) × (27 ^ m + 1) / (3 ^ 4m + 7) = 81, find M

If (9 ^ m + 3) × (27 ^ m + 1) / (3 ^ 4m + 7) = 81, find M

9^(m+3)*27^(m+1)/3^(4m+7)
=(3^2)^(m+3)*(3^3)^(m+1)/3^(4m+7)
=3^(2m+6+3m+3-4m-7)
=3^(m+2)
=81,
Then M + 2 = 4 and M = 2

How to divide 549 by 45, 125 times 88?

549/45=（540+9）/45=540/45+9/45=12+1/5=12.2
125*88=125*8*11=1000*11=11000

Calculation question 1 / 3 √ 5 * (- 9) / 1 / 6 √ 20
One third root 5 times negative 9 divided by one sixth root 20

One third radical 5 × (- 9) / one sixth radical 20
=(- 3 root 5) × 6 / root 20
=-18×1/2
=-9

In the formula 1 / 4 ／ 7 / 6 × 5 / 2 ／ 3 / 8 × 7 / 5 = 8 / 25, there is a wrong operation symbol, and the correct formula is ()

The correct answer is 1 / 4 ／ 7 / 6 ／ 5 / 2 ／ 3 / 8 × 7 / 5 = 8 / 25