a) 144 + 77 + 143 = 264 \(⋮\)11

b) 132 - 55 = 77 \(⋮\)11

c) 143 + 99 + 12 = 254 \(⋮̸\)11

d) 243 - 89 =154 \(⋮\)11

                                                Bài giải

\(a,\text{ }144+77+143=364⋮̸11\)

\(b,\text{ }132-55=77\text{ }⋮\text{ }11\)

\(c,\text{ }143+99+12=254\text{ }⋮̸\text{ }11\)

\(c,\text{ }243-89=154\text{ }⋮̸\text{ }11\)

17 + 32 + 39 + 55 x 67 + 53 =

TL:

17 + 32 + 39 + 55 x 67 + 53 =3826

học tốt

Đề bài là gì em làm cho.

=233

=843

=432

=688

Kết quả :

\(356-123=233\)

\(189+564=753\)

\(594-243=351\)

\(999-567=432\)

\(132+456=588\)

20,4375

20,4375

\(=\left(-67\right).\left(-33\right)-67.77+\left(-67\right).33-77.33\)

\(=\left[\left(-67\right).\left(-33\right)+\left(-67\right).33\right]-66.77-77.33\)

\(=-77\left(66+33\right)=-77.99=-7623\)

d) 12x 156 - 12 x 55 - 12

= 12 x ( 156 - 55 - 12 )

= 12 x 100

= 1200

e ) 12 x 11 + 21 x 11 + 11 x 33

= ( 12+ 21 + 33) x 12

= 66 x 11

= 726

g) 132 x 11 - 11 x 32 - 54 x 11

= ( 132 - 32 - 54 ) x 11

= 46 x 11

= 506

d) 12 x 156 - 12 x 55 - 12 = 12x(156 - 55 - 1 ) = 12 x 100 = 1200

e) 12 x 11 + 21 x 11 + 11 x 33 = 11  x ( 12 + 21 + 33 ) = 11  x 66 = 726

g) 132 x 11 - 11 x 32 - 54 x 11 = 11 x ( 132 - 32 - 54 ) = 11 x 46 = 506

a)

Cách 1.

\(\begin{array}{l}\left( {4 + 32 + 6} \right) + \left( {10 - 36 - 6} \right)\\ = 4 + 32 + 6 + 10 - 36 - 6\\ = 52 + \left( { - 36} \right) + \left( { - 6} \right)\\ = 52 + \left( { - 42} \right) = 52 - 42 = 10\end{array}\)

Cách 2.

\(\begin{array}{l}\left( {4 + 32 + 6} \right) + \left( {10 - 36 - 6} \right)\\ = 4 + 32 + 6 + 10 - 36 - 6\\ = 36 + 6 + 10 + \left( { - 36} \right) + \left( { - 6} \right)\\ = 36 + \left( { - 36} \right) + 6 + \left( { - 6} \right) + 10\\ = 0 + 0 + 10 = 10\end{array}\)

b) \(\left( {77 + 22 - 65} \right) - \left( {67 + 12 - 75} \right)\)

\(\begin{array}{l} = 77 + 22 - 65 - 67 - 12 + 75\\ = 77 - 67 + 22 - 12 + 75 - 65\\ = 10 + 10 + 10 = 30\end{array}\)

c) \( - \left( { - 21 + 43 + 7} \right) - \left( {11 - 53 - 17} \right)\)

\(\begin{array}{l} = 21 - 43 - 7 - 11 + 53 + 17\\ = 21 - 11 + 53 - 43 + 17 - 7\\ = 10 + 10 + 10 = 30\end{array}\)

Bài 1:Tính nhẩm

12 x 5 = 60     56 x 7 =392    67 x 7 =469    77 x 7 =539     55 x 6 =330    67 x 5 =335     138 x 2 = 276

Bài 2:Tính nhẩm

1345 + 954 =2299     8905 + 8905 =17810    6000 + 456 =6456     6050 + 650 = 6700    900 + 900 + 209 =2009

k mình nha

12x5 

=60

56x7

=392

67x7

=469

77x7

=539

55x6

=330

67x5

=335

138x2

=276

Bài 2:

1345+954

= 2299

8905+8905

=17810

6000+456

=6456

6050+650

=6700

900+900+209

=1800+209

=2009

k mình nha