1.2×0.2x=2.1的解方程？在线等急！

Question

如题所述

Answer 1

解由1.2×0.2x=2.1
得0.24x=2.1
即24x=210
即8x=70
解得x=35/4.

Answer 2

解：解方程, 此方程的解为x = 35/4,【即x = 8.75】
1.2 × （0.2）x = 2.1
（1×10+2）/10 × （2/10）x = （2×10+1）/10
12/10 × （1/5）x = 21/10
6/5 × （1/5）x = 21/10
（1/5）x = 21/10 ÷ 6/5
（1/5）x = 21/10 × 5/6
(1/5)x = 7/4
x = 7/4 ÷ 1/5
x = 7/4 × 5
x = 35/4
∴x = 8.75
答：此方程的解为x = 35/4,【即x = 8.75】本回答被网友采纳

Answer 3

1.2×0.2x=2.1
0.24x=2.1
x=2.1÷0.24
x=8.75

Answer 4

0.24X＝2.1
X＝2.1/0.24
X＝8.75

Answer 5

1.2×2.1+0.2×1-2x=2+1.