1 tính 3/4+2/5= 5/12-11/36= 3/4×5/12= 2/5:5/7= 7/10+7/9=

1 tính 3/4+2/5= 5/12-11/36= 3/4×5/12= 2/5:5/7= 7/10+7/9=
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