= 54 x 275 + 275 x 3 x 15 + 275

= 54 x 275 + 275 x 45 + 275

= 275 x ( 54 + 45 + 1 )

= 275 x 100 = 27500

đúng thì ủng hộ nha mấy bạn

 54x275+825x15+275=55x275+275x45

=(55+45)x275

=100x275

=27500

175 . 1274 - 175 . 273 - 175

= 175 . 1274 - 175 . 273 - 175 . 1

= 175( 1274 - 273 - 1 )

= 175 . 1000 

= 175 000

175.1274-175.273-175

175.(1274-273-1)

175.1000

175000

175000

a. 131.1961+1000/131.1961+1961-961

=131.1961+1000/131.1961+1000=1

b(2-4-6+8)+(10-12-14+16)+...+(2002-2004-2006+2008)=0

a/  270786.0606

Nhanh thấy sợ

  \(174\) x \(1274-175\) x \(273-175\)

\(=221676-47775-175\)

\(=173726\)

175 x 54 + 525 x 15 + 175

= 175 x 54 + 175 x (3 x 15) + 175

= 175 x 54 + 175 x 45 + 175

= 175 x (54 + 45 + 1) = 175 x 100 = 17500

Ta có : \(B=\frac{175.88-87}{88+175.87}=\frac{175.\left(87+1\right)-87}{88+175.87}=\frac{175.87+175-87}{88+175.87}=\frac{175.87+88}{88+175.87}=1\)

P/S : Dấu"." là dấu "x"

Cảm ơn bạn nhiều nhé :3

Lời giải:
1. Bạn coi lại đề

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$

1. ...............................

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$