Question

Answer 1

Bài 2 :\(a,\dfrac{x}{12}=\dfrac{5}{6}\Rightarrow x.6=12.5=60\\ \Rightarrow x=10\\ b,\dfrac{-24}{x}=\dfrac{2}{7}\Rightarrow-24.7=x.2=-168\\ \Rightarrow x=-84\\ c,\dfrac{x}{15}=\dfrac{9}{45}\Rightarrow x.45=15.9=135\\ \Rightarrow x=3\)

Answer 2

Bài 4:

a: -270/450=-3/5

b: -11/143=-1/13

c: 32/12=8/3

d: -26/-156=26/156=1/6

Câu 5:

a: 8/9>7/9

nên -8/9<-7/9

b: -2/5<0

c: 3/5=9/15

2/3-1/5=10/15-3/15=7/15

Do đó: 3/5>2/3-1/5