Question

7.3X-2.8X=27.9怎么算？

Answer 1

一元一次方程计算过程如下：
7.3X-2.8X=27.9
（7.3-2.8）X=27.9
4.5X=27.9
45X=279
X=279/45
X=31/5.

Answer 2

解：解方程, 此方程的解为x = 31/5，【即x = 6.2】
7.3X - 2.8X = 27.9

[（7×10+3）/10]x - [（2×10+8）/10]x = （27×10+9）/10
（73/10）x - （28/10）x = 279/10
（45/10）x = 279/10
(9/2)x = 279/10
x = 279/10 ÷ 9/2
x = 279/10 × 2/9
x = 31/5
∴x = 6.2
答：此方程的解为x = 31/5，【即x = 6.2】

Answer 3

解：7.3X-2.8X=27.9
4.5x=27.9
x=27.9÷4.5
x=6.2

Answer 4