=>x-7/13=1/2
=>x=1/2+7/13=13/26+14/26=27/26
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Các câu hỏi tương tự
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
10. 2 1/2 x 7/5 + {-9/10} x 2/3
11. X + 45% = 2 1/2 -5/3
12. 80% + X = -5/2 + 3/4
13. 4/25 - X =-5/2 + -3/10
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
bài 1 : tìm x
a ) 2/3 . X = 2/7
b ) X : 8/13 = 13/7
c ) 3/2 : X = 7/4
Tính:
a,35/11+(-7/13)-6/13-13/11 b,2 1/7-(-7/9)-25/9+6/7 c,132/321 x(-103/13)+(-27/13)x132/321
(Lưa ý:ở í b 2 1//7 là hỗn số)
a) x - = b) . c)
) : e) f) .
x
x
d x x x x x
3 13 2 4 3 7 2
1 3
5 25 3 5 10 15 3
4 5 1 7 2 11 1 1
3 15 1 3
5 7 6 5 5 2 3 2
(x+1/4-1/3):(2+1/6-1/4)=7/46
13/15-(13/21+x).7/12=7/10
Câu 13 : (-1/4 + 5/8 ) + -3/5
Câu 14 : M = 5/9 x 7/13 + 5/9 x 9/13 - 5/9 x 3/13
câu 15 : E = (-3/4 + 2/5) : 3/7 + (3/5 + -1/4) : 3/7
Câu 16 : H = 7/8 : (2/9 - 1/8) + 7/8 : (1/36 - 5/12)
X\1×4 + x\4×7 + x\7×10 + x\10×13 + x\13×16 = 5\2
Thực hiện phép tính:
1,-4/7 + 2/3x -9/14
2,17/13 - ( 4/13 - 11 )
3, 8 2/7 - ( 3 4/9 + 4 2/7 )
5, ( 2/3 - 1 1/2): 4/3 + 1/2
6, -5/13 + 2/5 + -8/13 + 3/5 - 3/7
7, 6/5 x 3/7 + 6/5 : 7/10 + 6/5
1.thực hiện phép tính:
a,5/13 + -5/7 + -20/41 + 8/13 + -21/41
b,-5/7 . 2/11 + -5/7 . 9/11 +1
c, (4/5 + 1/2) . (3/13 - 8/13)
2. a, x + 4/7=7/11
b, -5/6 - x = 7/12 + -1/3
c,x - 1/4 = 5/8 . 2/3
d,x/126 = -5/9 . 4/7
giúp mik vs mn ơi, mik đnag cần rất gấp