1- calcule os quocientes

a) (-42) : (+7)
b) (-32) : (-8)
c) (-72) : (-15)
d) (-80) : (-10)
e) (-48) : (+12)


2- efetue
a) (-1/9) x (+5/3)
b) (+5) x (+3/7)
c) (+11/9) : (+4/9)
d) (+2) : (-10/3)
e) (-1/8) x (+3/2) x (-4/3)

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