1. 4 times the sum of a and 9 () 2. 30 less than 5 times of X () 3. The sum of X and Y divided by their difference () 4. The sum of a and its reciprocal () 5. The square of the sum of M and n ()

1. 4 times the sum of a and 9 () 2. 30 less than 5 times of X () 3. The sum of X and Y divided by their difference () 4. The sum of a and its reciprocal () 5. The square of the sum of M and n ()

Use a formula containing letters to express the following quantitative relationship
4 times of the sum of a and 9: 4 (a + 9)
2. The number of 30 less than 5 times of X: 5x-30
3. The sum of X and Y divided by their difference: (x + y) / (X-Y)
4. The sum of a and its reciprocal: a + 1 △ a
5. The square of the sum of M and N: (M + n) & #178;
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