Question

2(x+2.6)=8怎么解方程 求求各位学霸了

Answer 1

解：解方程, 此方程的解为x = 7/5，【即x = 1.4】
2(x+2.6)=8
2x + 2 × 2.6 = 8
2x + 2 × （2×10+6）/10 = 8
2x + 2 × 26/10 = 8
2x + 2 × 13/5 = 8
2x + 26/5 = 8
2x = 8 - 26/5
2x = 40/5 - 26/5
2x = 14/5
x = 14/5 ÷ 2
x = 14/5 × 1/2
x = （7×2）/5 × 1/2
x = 7/5
∴x = 1.4
答：此方程的解为x = 7/5，【即x = 1.4】

Answer 2

2x+5.2=8
2x=2.8
x=1.4
还有一种方法
x+2.6=8÷2
x+2.6=4
x=4-2.6
x=1.4

Answer 3

2(x＋2.6)＝8
x＋2.6＝8/2＝4
x＝4－2.6＝1.4