Question

两道方程题

x+2/5=x/4和2x-1/3=x+2/4-1
答案和过程

Answer 1

解：x+2/5=x/4
移项：x-x/4=-2/5，3x/4=-2/5，得x=-8/15
2x-1/3=x+2/4-1
移项：x=1/3+2/4-1=1/3+1/2-1=2/6+3/6-1=-1/6

Answer 2

x+2/5=x/4
移项，得 x-x/4 = -2/5
即 3/4x = -2/5
x = - 8/15

2x-1/3=x+2/4-1
移项，得 2x-x = 2/4-1+1/3
即 x = -1/6

Answer 3

x+2/5=x/4 20(x+2/5) = 20(x/4)
20x + 8 = 5x
20x - 5x = - 8
15x = -8
x = -8/15

2x - 1/3 = x + 2/4 - 1 2x - x = 1/2 - 1 + 1/3
x = -1/2 + 1/3 = -3/6 - 2/6 = -1/6

Answer 4

-8/15,-1/6