2. Calculation: 30 ° 15 ′× 3 + 27 ° 18 ′ 6 steps to solve the problem!

2. Calculation: 30 ° 15 ′× 3 + 27 ° 18 ′ 6 steps to solve the problem!

30°15′×3＋27°18′÷6
=90°45′+4°+(3×60+18)′÷6
=90°45′+4°33′
=94°78′
=95°18′

X ^ 2Y ^ 2-3xy + 2 (a-2b) ^ 2-8a + 16b + 15 a simple method to calculate 540 ^ 2 + 460 ^ 2 + 1080 × 460

x^2y^2-3xy+2 （a-2b）^2-8a+16b+15
540^2+460^2+1080×460=1 000 000

(1) How many minutes does 0.75 ° equal? How many seconds does it equal? (2) how many minutes does 1080 "equal? How many degrees does it equal? (write the process)

0.75 * 60 = 45 points
0.75 * 60 * 60 = 2700 seconds
1080 / 60 = 18 points
18/60=0.3°
Conversion by 60

I run 100 meters for 15 seconds. How many meters did I run? How many seconds did I run 1 meter

Average per second: 100 / 15 = 20 / 3 (m)
1m time: 1 divided by 20 / 3 = 3 / 20 seconds