① () 30 = () 14 = 1.4 2.5 2 = () 5 7 = 21 () = () 20 is equal to ()

① () 30 = () 14 = 1.4 2.5 2 = () 5 7 = 21 () = () 20 is equal to ()

① (42) △ 30 = (19.6) of 14 = 1.4, 2.5 of 2 = (4) △ 10, 7 of 5 = 21 of (29.4) = (28) of 20 equal to (56) of (40)

How much is (- 7) + (- 21) + (- 7) + (+ 21)?

=-14

What is the equivalent of 7 degrees, 21 minutes and 30 seconds? The specific calculation process

7 degrees, 21 minutes, 30 seconds
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7 degrees = 7 * 3600 = 25200 seconds
21 minutes = 21 * 60 = 1260 seconds
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25200 seconds + 1260 seconds + 30 seconds
=26490 seconds

What is 21 / 3 + 7 / 2-7 / 3 + 7 / 3

It's equal to 10.5