Giải bài 1, 2, 3, 4 trang 8 Vở bài tập Toán 2 tập 1

1. a) Số?  

(1dm,,, = ,,,,cm,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,10cm,,, = ,,,,dm)

    b) Viết 1dm, 2dm vào chỗ chấm thích hợp:

 2. Số?

3.  Điền dấu >, <, =

(eqalign{
& 2dm,,,, = ,,,....,,,cm,,,,,,,,,,,,,,,,,,,,,,20cm,,,, = ,,,....,,,dm cr
& 3dm,,,, = ,,,....,,,cm,,,,,,,,,,,,,,,,,,,,,,,30cm,,,, = ,,,....,,,dm cr
& 5dm,,,, = ,,,....,,,cm,,,,,,,,,,,,,,,,,,,,,,,,50cm,,,, = ,,,....,,,dm cr
& 9dm,,,, = ,,,.....,,cm,,,,,,,,,,,,,,,,,,,,,,,90cm,,,, = ,,,....,,,dm, cr} )

4. Viết cm hoặc dm vào chỗ chấm thích hợp:

BÀI GIẢI

1.

a)    (1dm,,, = ,,10,,cm,,,,,,,,,,,,,,,,,,,,,,,,10cm,,, = ,,,1,dm)

b)

2. 

 (eqalign{
& ,,,,,,,,2dm,,,, = ,,,20,,,cm,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,20cm,,,, = ,,,2,,dm cr 
& ,,,,,,,,3dm,,,, = ,,,30,,cm,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,30cm,,,, = ,,,3,,,dm cr 
& ,,,,,,,,5dm,,,, = ,,,50,,,cm,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,50cm,,,, = ,,5,,,dm cr 
& ,,,,,,,9dm,,,, = ,,,90,,cm,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,90cm,,,, = ,,,9,,,dm cr} )

3.  

(eqalign{
& 8dm,,,, = ,,,80cm,,,,,,,,,,,,,,,,,,9dm,,,, - ,,,4dm,,, > ,,,,40cm, cr
& 3dm,,,, > ,,,20cm,,,,,,,,,,,,,,,,,,1dm,,,, + ,,,4dm,,, < ,,,,60cm, cr} )

4. 

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