calcule as seguintes produtos simplificando quando possível

a) 7/11 • 8/9


b) 4/9 • 6/5 • 2/6


c) 5/8 • 4/9 • 3/10


d) 4 • 5/9


e) 11/8 • 4


f) 6/15 • 3/8 • 5/3


g) 2 • 1/4 • 2 • 3/8


h) 4/5 • 5 • 6/8 • 2/7


por favor gostaria de saber alguem poderia me informar ​
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