Toán Lớp 8: 3)cho a;b;c khác 0 và 1/2a+1/3b+1/4c =1/2a+3b+4c
CMR : (2a+3b).(3b+4c).(2c+a)=0
4)cho a;b;c khác 0 thỏa 1/a+1/3b+1/5c=1/a+3b+5c
CMR : (a+3b).(3b+5c).(5c+a)=0
Moi nguoi giup minh voi a minh dang can gap a
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Toán Lớp 8: 3)cho a;b;c khác 0 và 1/2a+1/3b+1/4c =1/2a+3b+4c
CMR : (2a+3b).(3b+4c).(2c+a)=0
4)cho a;b;c khác 0 thỏa 1/a+1/3b+1/5c=1/a+3b+5c
CMR : (a+3b).(3b+5c).(5c+a)=0
Moi nguoi giup minh voi a minh dang can gap a
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