Question

已知方程0.4（x-0.2）+m=0.7x-0.38的解x=6,求m等于多少?

Answer 1

将x=6代入,

0.4(6-0.2)+m=0.7*6-0.38,

2.32+m =3.82,

m=3.82-2.32=1.5