
2x减去0.7×8等于2.4?
展开全部
解:解方程,此方程的解为x = 4
2x - 0.7 × 8 = 2.4
2x - 7/10 × 8 = (2×10+4)/10
2x - 28/5 = 24/10
2x - 28/5 = 12/5
2x = 12/5 + 28/5
2x = 40/5
2x = 8
x = 8 ÷ 2
x = 8 × 1/2
x = 8/2
∴x = 4
答:此方程的解为x = 4
2x - 0.7 × 8 = 2.4
2x - 7/10 × 8 = (2×10+4)/10
2x - 28/5 = 24/10
2x - 28/5 = 12/5
2x = 12/5 + 28/5
2x = 40/5
2x = 8
x = 8 ÷ 2
x = 8 × 1/2
x = 8/2
∴x = 4
答:此方程的解为x = 4
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