=4280510,tk mk

1235x3466=4280510

k nhé

3 nhân 11 nhân 9 nhân 25

\(\frac{1234.1235+1236.66-66}{1235.1236-1235.1106}\)

\(=\frac{1234.1235+\left(1236-1\right).66}{1235.\left(1236-1106\right)}\)

\(=\frac{1234.1235+1235.66}{1235.130}\)

\(=\frac{1235.\left(1234+66\right)}{1235.130}\)

\(=\frac{1300}{130}=10\)

`@` `\text {Ans}`

`\downarrow`

`a,`

\(\text{326 x 728 + 327 x 272}\)

`= 326 \times 728 + 326 \times 272 + 272`

`= 326 \times (728 + 272) + 272`

`= 326 \times 1000 + 272`

`= 362000 + 272`

`= 362272`

`b,`

\(\text{2008 x 867 + 2009 x 133}\)

`= 2008 \times 867 + 2008 \times 133 + 133`

`= 2008 \times (867 + 133) + 133`

`= 2008 \times 1000 + 133`

`= 2008000 + 133`

`= 2008133`

`c,`

\(\text{1235 x 6789 x (630 - 315 x 2 )}\)

`= 1235 \times 6789 \times (630 - 630)`

`= 1235 \times 6789 \times 0`

`= 0`

`d,`

\((m \div 1 - m \times 1 ) \div ( m \times 2008 + m + 2008)\)

`= (m - m) \div (m \times 2008 + m + 2008)`

`= 0 \div (m \times 2008 + m + 2008)`

`= 0`

a: =326*728+326*272+272

=326000+272

=326272

c: \(=1235\cdot6789\cdot\left(630-630\right)=0\)

d: \(=\left(m-m\right):\left(20009m+2008\right)=0\)

Có gì đó sai ở đây bạn ạ !

hinh nhu de sai roi bn oi

a)

x − 345 = 1235 x = 1235 + 345 x = 1580

b)

x × 28 = 312 × 14 x × 28 = 4368 x = 4368 : 28 x = 156

a: \(8\times427\times3+6\times573\times4\)

\(=24\times427+24\times573=24\times\left(427+573\right)\)

=24x1000

=24000

b: \(54\times47-47\times53-20-27\)

\(=47\times\left(54-53\right)-47\)

=47-47

=0

c: \(6\times1235\times20-5\times235\times24\)

=120x1235-235x120

=120x1000

=120000

d: \(\left(137\times99+137\right)-\left(17\times101-17\right)\)

\(=137\times\left(99+1\right)-17\times\left(101-1\right)\)

=137x100-17x100

=13700-1700

=12000

e: \(\left(145\times99+145\right)-\left(143\times101-143\right)\)

=145x(99+1)-143x(101-1)

=14500-14300

=200

g: \(\left(2003-123\times8:4\right)\times\left(36:6-6\right)\)

\(=\left(2003-123\times2\right)\times\left(6-6\right)\)

=0

Từ 1234=>9874 co số số hạng là:

      (9874-1234):1+1=8641(so)

Tổng của dãy số đó là:

      (9874+1234)*8641:2=47992114

               Đáp số:47992114