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Which units will be tested in the second volume of the seventh grade mathematics midterm?
The focus of mathematics in the next period of grade seven is in the first and third chapters. The deformation of several multiplication formulas must be tested.

Example: Given that m-2n = 3 and Mn = 2, find the square of (1)(m+2n)(2)m-the square of Mn+4n.

Solution: Because m-2n = 3 and Mn = 2, the square of (m-2n) = the square of m-the square of -4mn+4n = the square of m -8+4n =9.

So the square of m+the square of 4n = 17.

Square of (1) (m+2n) = square of m+square of +4mn+4n =25.

(2) the square of m-the square of Mn+4n = 15.

Solution of binary linear equations, geometric proof, triangle proof, plane rectangular coordinate system, drawing triangle, etc.

That's all, the problem may lie in geometric proof, triangle proof,