A/ X = 15 B/ X=120 W
2/ a/ x = 15 b/ x=120
W: www.hoc247.net F: www.facebook.com/hoc247.net Y: youtube.com/c/hoc247tvc
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0,5đW: www.hoc247.net F: www.facebook.com/hoc247.net Y: youtube.com/c/hoc247tvc
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0,5đ