1.Составить во к следующим ответам.
1. I am doing my homework now.
2. They usually do their homework in the evening
3. My mother went shopping last Friday.
4. My friends have been in Italy 2 years ago.
2. Используйте глаголы в скобках в правильной форме.
1. I (has written, wrote, have written)
the letter yesterday.
2. Tamara (has, have) already (cleans, cleaned) the room.
3. I (have done, is doing, am doing) my lessons now.
4. He (has done, have done, did) his exercises till six o’clock.
Объяснение:
( х² + 3)= 0 или ( х - 7) = 0
х²= -3 х=7
не имеет корней (корень не извлекается)
ответ: х = 7.
б) ( 3y - 1) ( y² + 1) = 0
3у-1 = 0 или у ² +1 = 0
3у=1 у²=-1
у=1 не имеет корней.
3
ответ: х = 1/3
в) ( z -1)² ( z+4) = 0
(z-1)² = 0 или z+4 = 0
z²-2z +1 =0 или z= -4
D=4-4=0
z=2/2=1
ответ: z=1;4.
г) г) (3t+12)(t+2)²=0.
3t+12 =0 или (t+2)² =0
3t=-12 t²+4t+4=0
t= -4 D=16-16=0
t= -4/2 = -2
ответ: t=-4; -2.
1.Составить во к следующим ответам.
1. I am doing my homework now.
2. They usually do their homework in the evening
3. My mother went shopping last Friday.
4. My friends have been in Italy 2 years ago.
2. Используйте глаголы в скобках в правильной форме.
1. I (has written, wrote, have written)
the letter yesterday.
2. Tamara (has, have) already (cleans, cleaned) the room.
3. I (have done, is doing, am doing) my lessons now.
4. He (has done, have done, did) his exercises till six o’clock.
Объяснение:
1.Составить во к следующим ответам.
1. I am doing my homework now.
2. They usually do their homework in the evening
3. My mother went shopping last Friday.
4. My friends have been in Italy 2 years ago.
2. Используйте глаголы в скобках в правильной форме.
1. I (has written, wrote, have written)
the letter yesterday.
2. Tamara (has, have) already (cleans, cleaned) the room.
3. I (have done, is doing, am doing) my lessons now.
4. He (has done, have done, did) his exercises till six o’clock.