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教学简易方程时,一位教师在课堂上评讲过两个解方程的题目。方程1.x-7+3=6。学生解答时,出现了两种不同的解法。第一种是解.x-7=6-3, x=3+7, x=10。第二种是解:x-10 6, x=16。面对这两种解法,教师指出:第一种解法正确,第二种解法不对。因为原方程的左边是x-7+3,不是x-(7+3)。同时,教师又用代入x的值去检验的办法,说明x=10的确是正确的,x=16的解法确
Teaching simple equations, a teacher in the classroom commented on two topics solving equations. Equation 1.x-7 + 3 = 6. When students answered, two different solutions emerged. The first solution is .x-7 = 6-3, x = 3 + 7, x = 10. The second is solution: x-10 6, x = 16. Faced with these two solutions, the teacher pointed out: The first solution is correct, the second solution is wrong. Because the left side of the original equation is x-7 + 3, not x- (7 + 3). At the same time, the teacher again used the method of substituting the value of x to test, indicating that x = 10 is indeed the correct solution x = 16