Some problems about arithmetic of significant number Is the operation process of 8.0421 / (6.038-6.034) + 30.9 like this?: 6.038-6.034 = 0.004 8.0421/0.004 = 2205.25 (since the least significant digit is one, the result should also retain one significant digit, so the original formula is about 2 * 10 ^ 3? So it can be added to 30.9. According to the highest suspicious digit, is the result still 2 * 10 ^ 3? There is another problem, Is the approximate number of 2205.25 taken first and then added by 30.9, or is the approximate number of 2205.25 and 30.9 taken first and then added by 30.9?

Some problems about arithmetic of significant number Is the operation process of 8.0421 / (6.038-6.034) + 30.9 like this?: 6.038-6.034 = 0.004 8.0421/0.004 = 2205.25 (since the least significant digit is one, the result should also retain one significant digit, so the original formula is about 2 * 10 ^ 3? So it can be added to 30.9. According to the highest suspicious digit, is the result still 2 * 10 ^ 3? There is another problem, Is the approximate number of 2205.25 taken first and then added by 30.9, or is the approximate number of 2205.25 and 30.9 taken first and then added by 30.9?

The result is 2x10 ^ 3, but the steps are wrong

Casio calculator angle addition and subtraction
How can Casio calculator be set to add and subtract the angle accurate to the second? For example, I need to calculate 30 ° 23'45 "+ 16 ° 12", how can I do it? (I need to input it directly instead of 30 + 23 / 60 + 45 / 3600)

1. MR (clear memory) 230 * 13 m + 150 * 7 m + MC (display answer)
2. MR (clear memory) 2 m + 5 * 3 M + 6 m + 8 * 2 m - 1 / 2 m + MC (show answer)

Using 1234567899, the result is 12345678910, only adding and subtracting, not multiplying and dividing, and brackets
1 2 3 4 5 6 7 8 9 =1
1 2 3 4 5 6 7 8 9 =2
1 2 3 4 5 6 7 8 9 =3
1 2 3 4 5 6 7 8 9 =4
1 2 3 4 5 6 7 8 9 =5
1 2 3 4 5 6 7 8 9 =6
1 2 3 4 5 6 7 8 9 =7
1 2 3 4 5 6 7 8 9 =8
1 2 3 4 5 6 7 8 9 =9
1 2 3 4 5 6 7 8 9 =10

1+2+3+4+5-6-7+8-9=1
12+3+4-5-6-7-8+9=2
1+2+3+4+5-6-7-8+9=3
12+3-4+5-6-7-8+9=4
1+2-3-4-5+6+7-8+9=5
12+3-4-5+6-7-8+9=6
1+2-3-4-5+6-7+8+9=7
12+3-4-5-6+7-8+9=8
1+2-3-4-5-6+7+8+9=9
12+3-4-5-6-7+8+9=10