2,8dm2 = 28 cm

Chiều dài củ tấm bảng là : 28 ÷ 14 = 2cm 

Đáp số 2cm

4 NHJA

bằng 4

Bằng 6283801,6 nha

BẰNG 160 NHA

= 567 x ( 1324 - 323 - 56 )

= 567 x 945

= 535815

535 815

Answer:

\(72-2x^2-2y^2+4xy\)

\(=2.36-2x^2-2y^2+2.2xy\)

\(=2.(36-x^2-y^2+2xy)\)

\(=2.[36-(x^2-2xy+y^2)] \)

\(=2.[6^2-(x-y)^2]\)

\(=2[6-(x-y)][6+(x-y)] \)

\(=2.(6-x+y)(6+x-y)\)

\(x^2+7x+6\)

\(=x^2+x+6x+6\)

\(=(x^2+x)+(6x+6)\)

\(=x(x+1)+6(x+1)\)

\(=(x+1)(x+6)\)

Nếu thêm mỗi quyển văn 18 trang 

Thì hai loại sách có số trang là :

150 x 22 = 3300 ( trang )

Có số sách văn là :

( 3300 - 3120 ) : 18 = 10 ( quyển )

Có số sách toán là :

22 - 10 = 12 ( quyển )

             Đáp số : 10 quyển và 12 quyển 

ươ

/

nhiiuoiili,o=-ơ\\=ư

ư

         =pươ=-ơ=-\\ơ]

'AaaaaaaaaaaaaAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassssssssssssssssssssaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss

nnoo sai