(38.6-12.75) / 2.5 * 0.3

(38.6-12.75) / 2.5 * 0.3

You wrote the division sign
（38.6-12.75）/2.5*0.3
=25.85÷2.5×0.3
=10.34×0.3
=3.102
There is no easy way

Simple calculation 1 and 3 / 4 + (- 2 and 1 / 6) + (- 1.75) + 3 and 2 / 3 =?

1 and 3 / 4 + (- 2 and 1 / 6) + (- 1.75) + 3 and 2 / 3 = 1.5
1,3 / 4 and -1.75 are the same, and the sign is negative,
The formula is as follows:
3 and 2 / 3-2 and 1 / 6 =
3 and 4 / 6-2 and 1 / 6 = 1 and 3 / 6 = 1 and 1 / 2 = 1.5

How to calculate 24.75 * 4 plus 5.6/35

[(24 * 4 + 3) / 4] * 4 after about 4, it is easy to get 99
7 * 0.8 / (5 * 7) about 0.16 after 7

Who knows how to calculate 5.24-3.18 + 4.76-6.82?

5.24-3.18+4.76-6.82
=[5.24+4.76]-[6.82+3.18]
=10-10
=0