31)calcule mentalmente
A)1/7+6/7 E)0,5+1/2
B)5/6-1/3 F)5/6+1,3+1/6+0,7
C)0,75-1/4
D)1/3+1/3+1/3
Soluções para a tarefa
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a)7/7=1
b)10-3/12=7/12
c)3/4-1/4=1/2
d)1+1+1/3=3/3=1
e)1/2+1/2=2/2=1
f)5/6+13/10+1/6+7/10=6/6+20/+10=1+2=3
b)10-3/12=7/12
c)3/4-1/4=1/2
d)1+1+1/3=3/3=1
e)1/2+1/2=2/2=1
f)5/6+13/10+1/6+7/10=6/6+20/+10=1+2=3
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