0.4×12-4 x=0.8怎么检验？
1个回答
展开全部
解：解方程, 此方程的解为x = 1
0.4 × 12 - 4x = 0.8
4/10 × 12 - 4x = 8/10
2/5 × 12 - 4x = 4/5
24/5 - 4x = 4/5
4x = 24/5 - 4/5
4x = 20/5
4x = 4
x = 4 ÷ 4
x = 4 × 1/4
x = 4/4
∴x = 1
经检验，0.4 × 12 - 4 × 1 = 0.8符合题意
答：此方程的解为x = 1
0.4 × 12 - 4x = 0.8
4/10 × 12 - 4x = 8/10
2/5 × 12 - 4x = 4/5
24/5 - 4x = 4/5
4x = 24/5 - 4/5
4x = 20/5
4x = 4
x = 4 ÷ 4
x = 4 × 1/4
x = 4/4
∴x = 1
经检验，0.4 × 12 - 4 × 1 = 0.8符合题意
答：此方程的解为x = 1
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
