mn giúp mk vs,mk cần gấp lắm
Làm đc mk tick
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1 tháng 7 2023
a: (x-4)(x+5)>0
=>x-4>0 hoặc x+5<0
=>x>4 hoặc x<-5
b: (2x+1)(x-3)<0
=>2x+1>0 và x-3<0
=>-1/2<x<3
c: (x-7)(3-x)<0
=>(x-7)(x-3)>0
=>x>7 hoặc x<3
d: x^2+6x-16<0
=>(x+8)(x-2)<0
=>-8<x<2
e: 3x^2+7x+4<0
=>3x^2+3x+4x+4<0
=>(x+1)(3x+4)<0
=>3x+4>0 và x+1<0
=>-4/3<x<-1
f: 5x^2-9x+4>0
=>(x-1)(5x-4)>0
=>x>1 hoặc x<4/5
g: x^2+6x-16<0
=>(x+8)(x-2)<0
=>-8<x<2
h: x^2+4x-21>0
=>(x+7)(x-3)>0
=>x>3 hoặc x<-7
i: x^2-9x-22<0
=>(x-11)(x+2)<0
=>-2<x<11
l: 16x^2+40x+25<0
=>(2x+5)^2<0(loại)
m: 3x^2-4x-4>=0
=>3x^2-6x+2x-4>=0
=>(x-2)(3x+2)>=0
=>x>=2 hoặc x<=-2/3
TN
2
CD
8 tháng 3 2018
http://baigiang.violet.vn/present/show/entry_id/6146495
Tham khảo đi. cho cj nhé
13 When was your homework done?
14 A very good birthday cake was mae by her mother
15All the food was eaten by the guests
16 An interesting film was watched on TV last night
17 Many new words were learned yesterday afternoon
18 Vegetables weren't bought yesterday
19 Were the goldfish fed ?
20 Some wine was brought to the party
----------------------------------------
1 My homework has been done
2 Has this film be seen?
3 Lunch hasn't been cooked by my sister yet
4 The letter hasn't been sent for me
5 A lot of food has been bought by my father
6 That regulation hasn't been changed by the government yet
7 That famous novel has been translated by many scholars
8 That copper pot has been polished brightly
9 Our cat has been chased by the dog all morning
10 The leaves has been turned yellow by the weather