Bài 4: Bài Giải

Giá bán của chiếc máy tính sau khi giảm giá là:

15 750 000 x 10 : 100 = 1 575 000(đồng)

Đáp số: 1 575 000 đồng

Bài 3:

A: 0,125 x 7,21 x 80

= 7,21x(0,125 x 80)

= 7,21 x 10

= 721

B: 7,3 x 0,001+ 92,7 x 0,001

= (7,3 + 92,7) x 0,001

= 100 x 0.001

= 0,1

Bài 2:

31,6 + 17,92 = 50,52

315,7-12,23 = 303,47

3,6 x 4,1 = 14,76

32,4 : 4,5 = 7,2

Bài 1a: 63 tạ = 6,3 tấn

b: 721mm = 0,721m

c: 9km2 7 ha = 9,07 km2

d:4l 4ml = 4,004l

Q1: Is on the ground floor

Q2: He likes solving maths problems

Q3: Yes, They did

Q4: They danced around the campfire

Q5: It's Ben's

Last Summer, my family went to Hoan Kiem Lake, a big lake in Ha Noi.In the morning, we walked around the lake. In the afternoon, we have lunch in a small restaurant. In the evening, we go home by bus. We had a lot of fun there

Q1: Emma

Q2: Go past the library and turn right

Q3: They are beside the window

Q4: They planted trees