BG

Số học sinh xếp loại tốt là:

45×4/15=12(HS)

Số học sinh xếp loại khá là:

12×5/3=20(HS)

Số học sinh xếp loại đạt là:

45-12-20=3(hs)

Vậy số học sinh xếp loại đạt là 3hs.

a,1/2-1/2÷x=3/4

1/2÷x=3/4-1/2

1/2÷x=1/4

x=1/2÷1/4

x=-2

Vậy x=-2

b, x-1/15=3/5

x-1=3/5×15

x-1=9

x=9+1

x=10

Vậy x=10

c, x+2,5=1,4

x=2,5-1,4

x=1,1

Vậy x=1,1

A=(2,34+7,66)+(5,35+4,65)

=10+10=20

B=2,13×(75+25)

=2,13×100

213

C=1/3-1/3:3/4

=1/3-4/9=2/9

My ideal robot would be named " Helper". lt's a versatile, humanoids service robot designed for household tasks and personal assistance. Helper could handle chores like cleaning , laundry,and cooking, freeing up my time for other activities. I want Helper because it would significantly improve my daily life by reducing street and increasing efficiency.

1, Robots can work as guards in important places.

2, Ha Noi is famous for its delicious street food.

3, What type of house will you live in in the future?

4, Pack your lunch in a lunch box instead of a plastic bag.