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Bài `1:`

`a) 36/108 = (36:36)/(108:36)=1/3`

`b) 25/100=(25:25)/(100:25)=1/4`

`c) 1212/1313=(1212:101)/(1313:101)=12/13`

`d) (-450)/540=(-450:90)/(540:90)=-5/6`

`e) (-75)/(-300)=75/300=(75:75)/(300:75)=1/4`

Bài `2:`

`a) ((-3).8)/(8.6)=(-3.8)/(8.2.3)=-1/2`

`b) (12.(-25))/(30.18)=(6.2.(-5).5)/(2.3.5.6.3)=(2.(-5))/(3.3)=-10/9`

`c) ((-14).(-5))/(10.14)=(14.5)/(5.2.14)=1/2`

`d) ((-32).(-9).3)/(6.27.8)=(8.2.2.9.3)/(2.3.9.3.8)=2/3`

Bài `3:`

`a) (11.4-11)/(2-13)=(11(4-1))/-11=-3`

`b) (7.6-7.4)/(7.3)=(7(6-4))/(7.3)=(7.2)/(7.3)=2/3`

`c) 49/(49+7.49)=49/(49(1+7))=1/8`

`d) (17.5-17)/(3-20)=(17(5-1))/-17=-4`