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通过一次方程组和一元二次方程的学习,我们学会了运用“消元”或“降次”的数学思想方法,把较复杂的方程和方程组转化为一元一次方程,从而求出原方程的根。通过“消元”、“降次”、“换元”等方法将较复杂的方程问题化繁为简的思想,称为化归思想,这种化归思想和意识,在学习本单元时,显得尤为重要。 九年义务教材中介绍的可化为一元二次方程的方程(组)有分式方程、无理方程、简单的高次方程和简单的一元二次方程组,在本单元的
Through the study of a system of equations and quadratic equations, we learned to use mathematical methods of “elimination or reduction” to transform the more complex equations and equations into a one-dimensional first-order equation, so as to obtain the original equations. root. Through the “elimination of yuan,” “decrease,” “replacement” and other methods to simplify the more complex equations of the problem, known as the return to the idea, this return to the idea and consciousness, when learning this unit, It is particularly important. The equations (groups) that can be converted into a quadratic equation introduced in the nine-year compulsory textbooks are fractional equations, irrational equations, simple higher order equations, and simple unary quadratic equations, in this unit