cho x, y, z thỏa mãn x^3+y^3+3xyz<0 và z>0. chứng minh x+y<z
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Khách
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PB
5
KS
18 tháng 2 2022
TL
a) X. 7/2=7/9
X=7/9:7/2
X=2/9
b) X.:8/5=5/2
X=5/2.8/5
X=4
HT
PC
Phạm Chấn Phong
VIP
18 tháng 2 2022
kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
LN
10
19 tháng 2 2022
Ta có f(x) = g(x)
\(-3x^2+2x+1=-3x^2+x-2\Leftrightarrow x=-3\)
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