Question

小明解方程2x-3/5+1=x+a/2时,由于粗心大意,在去分母时,方程左边的1没有乘以10,由此求的解为x=0,试求a

Answer 1

2(2x - 3) + 1 = 5(x + a)

把 x = 0 代入得:

2×(-3) + 1 = 5a

5a = -5

a = -1

(2x - 3)/5 + 1 = (x - 1)/2

2(2x - 3) + 10 = 5(x -1)

4x - 6 + 10 = 5x - 5

x = -6 + 10 + 5

x = 9