6.9 a, -1/3 x X =1 b, X x5/7 =-1/9 c, X : 4/7 =-5/7 d, -1/5 : X = -1/8
2 câu trả lời
a, -1/3 x X =1
⇒X=1: -1/3
⇒X=-3
Vậy X=-3
b, X x5/7 =-1/9
⇒X=-1/9:5/7
⇒X=-7/45
Vậy X=-7/45
c, X : 4/7 =-5/7
⇒X=4/7.-5/7
⇒X=-20/49
Vậy X=-20/49
d, -1/5 : X = -1/8
⇒X=-1/5:-1/8
⇒X=8/5
Vậy X=8/5
`a)-1/3xx x=1`
`x=1:(-1/3)`
`x=-3`
`b)x xx5/7=-1/9`
`xx=-1/9:5/7`
`xx=-7/45`
`c)x:4/7=-5/7`
`x=-5/7xx4/7`
`x=-20/49`
`d)-1/5:x=-1/8`
`x=-1/5:-1/8`
`x=-8/-5=8/5`