Mấy bạn giải giúp Mik với
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ZS
3
31 tháng 8 2021
m2 -8m -16 =0
m2 -2.4m -4\(^2\) =0
(m - 4)\(^2\) = 0
=> m -4 = 0
=> m = 4
HT
31 tháng 8 2021
m2 - 8m - 16 = 0 <=> m2 - 8m + 16 - 32 = 0
<=> ( m - 4 )2 - ( 4√2 )2 = 0 <=> ( m - 4 - 4√2 )( m - 4 + 4√2 ) = 0
<=> m = 4 ± 4√2
J
1
27 tháng 9 2017
5x-x-13=27
5x-1x=27+13
5x-1x=40
x.(5-1)=40
x.4=40
x=40:4
x=10
TG
2
DT
Đỗ Thanh Hải
CTVVIP
9 tháng 8 2021
1 How was the lost man found by the police?
2 It was declared that she had won the competition
3 Has the window of the laboratory been changed?
4 Peter asked Janet if he could borrow her typwriter
5 My grandmother told me to feed her dog while she was away
6 My younger sister told me to lend her some more money
7 If I were tall enough,I would join the basketball team
8 If we don't hurry up, we will be late for the exam
9 If he hadn't gone out late last night, he wouldn't have been punished
10 I wish the weather hadn't been bad yesterday
HT
1
LT
1
1 tháng 11 2016
Ta có: A= x^3 + y^3 + xy
= (x+y)(x^2 - xy + y^2) + xy
= x^2 - xy + y^2 + xy
= x^2 + y^2 >= 0
Vậy MinA=0 khi x=0 và y=0
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