HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1.The man said that he had been standing that queue for two hours
2.His sister said to Tom that he would burn himself if he kept playing with matches
3.Linda said to Mary that she was really sorry that she had woke up that morning
4.Lucia said to Peter that she think he was right.They ought to let the others know
1.You are saving money now.Are you going to buy a computer next week?
2.Because he was lazy,he failed the exam.
CHÚC HỌC TỐT!!!!!!!!!!
a, A=x2-10x+5
=(x-5)2-20
Do (x-5)2>hoặc=0 vs mọi x=>(x-5)2-20>hoặc=-20 vs mọi x
Dấu'=' xảy ra khi :(x-5)2=0=>x-5=0=>x=5
Vậy Amax=-20 khi x=5
b,TƯƠNG TỰ
Bmax=21 khi x=\(\dfrac{5}{3}\)
c,TƯƠNG TỰ
Cmax=13 khi x=-2
d,Tớ ko bt lm
(x+y)2+2(x+y)(x-y)+(x-y)2
=(x+y+x-y)2
=(2x)2
=4x2
55.253=55.(52)3=55.52.3=55.56=55+6=511
(1)the
(2)up
(3)to
(4)so
(5)which
(6)because
(7)were
(8)could
(9)for
(10)least
(11)in
(12)more
(13)were
(14)from
(15)a
A
1.I think I've achived success weight in the last few months
3.I hope James gets over his illness soon
5.If you're tired,let down on the sofa for half an hour
(1)is
(2)lives
(3)received
(4)have
(5)eat
(6)cooks
(7)is
(8)wrote
(9)introduced
(10)sent
Cho tam giác ABC. Chứng minh rằng nếu có điểm D nằm trong tam giác sao cho AB=AD thì AB<AC
Giúp tớ nhé!!!!!!!!!Mai tớ học rùi