How many addition and subtraction methods do you learn in grade one of primary school?

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• 14. The addition and subtraction of rational numbers in the first day of junior high school! 1. The value of a + B-C is equal to that of a + b-c A.a-(-b)-(-c) B.a-(-b)-(+c) C.a+(-b)-c D.a+(c-b) 2. Seek | 1 / 10-1 / 11 | + | 1 / 11-1 / 12 | + | 1 / 12-1 / 13 | + +|The value of 1 / 49 + 1 / 50 |
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• 16. Give me 10 ways of rational number addition and subtraction Give me 10 elementary one's rational number addition and subtraction method, 10 one variable linear equation It needs to be square
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