1. my mother makes me do the housework every day

->I am

2.how long have you worked in this company

->when did

3.if we don't save water, we will have no water to use in the future

->unless we

4.students don't have to wear uniforms today

->it isn't

5.i would prefer you not to smoke in here

->i'd rather

1"how much do you think it will cost?"he said to me

he asked me

2.it takes Minh 2 hours to do his homework everyday

minh spends

3.we were late for school because of the heavy rain

because it

4.my mother used to make us clean the house

we used

5.it's two years since i last spoke to her

i haven't

1.lan hasn't visited her grandmother for two months

the last

2.she can't lift the table because she is not strong enough

If

3.the students must complete the test on time

the test

4.his bike was broken, so he arrived late for the concert

because of

5."what kind of books do you like best, linda?"asked peter

5.the secretary said she was sorry she was late for the meeting

=>the sexretary apologized

1.ba said to trung,"would you like a cup of tea?"

=>ba offered

2.they did the work excellently

=>the work

3.hue, the former capital of vietnam, is acknowledged as the world's cultural heritage

=>hue, which is

4.she is always a better performer than her mother used to

=>her mother never used to give

5.the secretary said she was sorry she was late for the meeting

=>the sexretary apologized

5.I become familiar to living in this quiet neighborhood

=>I

1.They have considered me as their great friend

=>I

2."do you know my teacher's phone number,Nam?"said Mai

=>Mai asked

3.Chi pu does not take exercise regularly, so she becomes obese

=>If

4.All of the buildings in this town aren't as highas yours

=>your building

5.I become familiar to living in this quiet neighborhood

=>I

a) CMR: nếu a+b+5c=0 thì pt ax² + bx +c =0(a\(\ne\)0) có 2 nghiệm phân biệt

b)tìm m để pt x²-(2m+4)x+3m+2=0 có 2 nghiệm phân biệt x₁, x₂ thỏa mãn x₂=2x₁+3

c)tìm m để pt x²-mx+1=0 có 2 nghiệm phân biệt đều lớn hơn 2

lớn hơn 7/9 là : 8/9 ; 9/9 ; 10/9 ; 11/9 ; 12/9 ; 13/9 ; 14/9 ; 15/9 ; 16/9

bé hơn 7/8 là : 6/8 ; 5/8 ; 4/8 ; 3/8 ; 2/8 ; 1/8 ; 1/9 ; 1/10 ; 1/11