Question

二x+0.82=8点二,解方程？

Answer 1

解：解方程, 此方程的解为x = 369/100，【即x = 3.69】
二x+0.82=8点二

2x + 82/100 = 8.2
2x + 41/50 = (8×10+2)/10
2x + 41/50 = 82/10
2x = 82/10 - 41/50
2x = 410/50 - 41/50
2x = 369/50
x = 369/50 ÷ 2
x = 369/50 × 1/2
x = 369/100
∴x = 3.69
答：此方程的解为x = 369/100，【即x = 3.69】

Answer 2

2✘=8.2-0.82
✘=(8.2-0.82)/2
=4.1-0.41=3.69
把ⅹ项与常数项分别移到等号的两边，把ⅹ的系数2化简为1。

Answer 3

2x+0.82=8.2
2x=8.2-0.82
2x=7.38
x=7.38/2
x=3.69