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The learning method is reported in the third issue of the ninth grade of Mathematics Weekly People's Education Edition.
22. 1 unary quadratic equation
Self-test:1.d2.d3.b.
4.x？ +6x-280=0
5.2 times? +5x+3=0
6.50 times? -25x+3=0
Self-breakthrough: solution: from the meaning of the question, 3-a=2, 3b-4=2, a= 1, b=2, then ...