`-5/7xx8/17+(-5/17)xx9/7-2/7`
`=-5/7xx(8/17+9/17)-2/7`
`=-5/7xx17/17-2/7`
`=-5/7xx1-2/7`
`=-7/7=-1`
`-5/7xx8/17+(-5/17)xx9/7-2/7`
`=-5/7xx(8/17+9/17)-2/7`
`=-5/7xx17/17-2/7`
`=-5/7xx1-2/7`
`=-7/7=-1`
bài 1 Tính:
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
giúp tớ vs ạ. Tớ CẢM ƠN
*tớ thêm một câu nữa ạ
c) 5/9 * 7/13 + 5/9 * 9/13 + 3/13 * -5/9
Tìm x biết
d) 32%-0,25:x=-17/5
e)(x+1/5)^2+17/25=26/25
f)-32/27-(3x-7/9)^3=-24/27
g)60%x+0,4x+x:3=2
h)|20/9-x|=1/12+1/20+1/30+1/42+1/56+1/72
i)8/5+(2/7+2/17+2/37/5/7+5/17+5/37).x=16/5
Lưu ý: câu i 2/7+2/17+2/37 phần(vế trên) 5/7+5/17+5/37(vế dưới)
5/9 × 8/17+ 3/17 : 9/7 - 5/9 7/3 × 6/ 11 + 7 / 11 - 5 /13 + 6/ 13
Tìm x nha
Giấu《 là dấu < hoặc bằng
1)-8/3+-1/3<x<-2/7+-5/7
2)8/17+5/17<×/17<10/17+5/17
8)-5/6+8/3+-29/6《x《-1/2+2+5/2
9)-8/11+2/11+13/11《x《8/15+9/15-2/15+2
7)×/5=-5/16+3/4-1/2
Tính nhanh
a)-2/5.4/7+-3/5.2/7+-3/5
b)5/9.14/17+1/17.5/9+2/9.5/17
c)8/19.5/11+7/9.8/11-8/19.1/17
5/9 × 8/17+ 3/17 : 9/7 - 5/9 7/3 × 6/ 11 + 7 / 11 - 5 /13 + 6/ 13 -7/25÷ (-14/39)÷ 50 /78 Giúp tui với tui đang cần gấp
5/9 × 8/17+ 3/17 : 9/7 - 5/9
5/9 × 8/17+ 3/17 : 9/7 - 5/9