B
baicadihoc


Tính nhanh
0,25-1/5+1/7 1/2+1/3 -0,2
__________ + ____________
0,75-3/5+3/7 3/4+0,5-3/10
0,25-1/5+1/7 1/2+1/3 -0,2
__________ + ____________
0,75-3/5+3/7 3/4+0,5-3/10
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