A

-3/5+-2/5+3/11+8/11+5/7

=(-3/5+-2/5)+(3/11+8/11)+5/7

=-1+1+5/7

=0+5/7

=5/7

my son doesn't practice the piano everyday

lực

a) x-75=-26

    x     =-26 + 75

    x     = 49

b) (8-x).(x+15)=0

suy ra 8-x=0 hoặc x+15=0

8-x=0      x=8-0   x=8

x+15=0   x=0-15  x=-15

vậy x thuộc { 8;-15}

1011=1011,0

Trung bình mỗi phút cô Lan đi được :

              2,4 : 15 = 0,16 (km)

                          Đáp số : 0,16 km

I have a brother. His name is Duc. He is six years old. He has short black hair and chubby cheecks. He is very funny and always entertains me with jokes. I like him because he makes me laugh plays with me every day. He is my best friend in my family

Question 1 : There is a reading room for kids in the library

Question 2 : The library is in front of the playground

Question 3 : Minh's bike is in the garage

Question 4 : My uncle is going to work by car

Mặc trang phục gọn gàng, sử dụng các dụng cụ bảo hộ khi làm thí nghiệm

Chỉ làm thí nghiệm khi có sự hướng dẫn và giám sát của giáo viên