Cho a, b,c là ba số thực thỏa mãn a, b>0 và a+b+c=1. Chứng minh rằng
a) (a+b)*(a+c)=a+bc
<...
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Mathematics, 27.09.2021 03:10 summer132
Cho a, b,c là ba số thực thỏa mãn a, b>0 và a+b+c=1. Chứng minh rằng
a) (a+b)*(a+c)=a+bc
b)
=a+b
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