Respostas

2013-10-04T12:32:13-03:00
E) X/45=2/9

9X=90
X=90/9
X=10



F) 2/3=X/51

3X=2.51

3X=102

X=102/3

X=34

G) 35/20=X/4

20X=140

X=140/20

X=7


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