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161 seconds
Adam
138 seconds
Ranking
Test: Subtracting fractions
1)
1
2
1
×
2
×
−
=
−
=
−
=
3
7
3
×
7
×
2)
3
4
3
×
4
×
−
=
−
=
−
=
6
12
6
×
12
×
3)
1
1
1
×
1
×
−
=
−
=
−
=
5
10
5
×
10
×
4)
2
3
2
×
3
×
−
=
−
=
−
=
3
5
3
×
5
×
Check
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