Đáp án:1,, x =3/7 2, x =5/2/3 5, x =-3/4 6, x = -11/16
9, x = 4/1/2 10, x=-4/7 hoặc x = 8/7
Giải thích các bước giải:
1, 5/4/7 : x = 13 2, 3/1/2-1/2x =2/3
x = 5/4/7 :13 1/2x =3/1/2-2/3
x =3/7 1/2x =2/5/6
x =2/5/6:1/2
x =5/2/3
5, (3/1/2+2x).2/2/3=5/1/3 6, x:3/4 +1/4 =-2/3
3/1/2 +2x =5/1/3:2/2/3 x:3/4 =-2/3 -1/4
3/1/2 +2x =2 x:3/4 =-11/12
2x = 2-3/1/2 x = -11/12 * 3/4
2x = -1/1/2 x = -11/16
x = -1/1/2 :2
x =-3/4
9, (5/3x-3) :15 =3/10 10, / x-2/7 / =-9/14*-4/3
5/3x-3 =3/10 * 15 / x-2/7 / =6/7
5/3x-3 =4/1/2 x-2/7 = -6/7 hoặc x-2/7=6/7
5/3x =4/1/2+3 x= -6/7 +2/7 hoặc x =6/7+2/7
5/3x =7/1/2 x=-4/7 hoặc x = 8/7
x =7/1/2 : 5/3
x = 4/1/2 ( / là dấu giá trị tuyệt đối)
