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[Urgent] (High Score Award) Grade 7 Mathematics Volume I (Algebra)
1, the answer is 0, the most earthy method, which can be verified by examples.

2. The answer is 70

3. The answer is 33

4. The answer is 37

5. The answer is that the original question B needs to know the values of a = 3b, c = 4a and the algebraic expression (4a-9b+3c) ÷ (3a-6b+c).

6. The answer is that the square of (n-1) (n+1) = n-1is the square difference formula.