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Use any method to solve the system of linear equations,find (x,y) .
Q17: Find x and y. <span
Q23: Use matrices to solve the system
Q25: Find the absolute value of the
Q26: Use the sum-to-product formulas to rewrite
Q30: Use the product-to-sum formulas to rewrite
Q34: Write the partial fraction decomposition of
Q41: If <span class="ql-formula" data-value="\| \mathbf
Q44: Use the inverse formula <span
Q57: Determine the order of the matrix.
Q77: Plot the complex number and find