3876 x 375 + 375 x 6124
= 375 × (3876 + 6124)
= 375 × 10000
= 3750000

1327 x 524 - 524 x 327
= 524 × (1327 - 327)
= 524 × 1000
= 524000

257 x 432 + 257 x 354 + 257 x 214
= 257 × (432 + 354 + 214)
= 257 × 1000
= 257000

325 x 1574 - 325 x 325 - 325 x 249
= 325 × (1574 - 325 - 249)
= 325 × 1000
= 325000

312 x 425 + 312 x 574 + 312
= 312 × (425 + 574 + 1)
= 312 × 1000
= 312000

175 x 1274 - 175 x 273 - 175
= 175 × (1274 - 273 - 1)
= 175 × 1000
= 175000

312 x 425 + 312 x 574 + 312
= 312 × (425 + 574 + 1)
= 312 × 1000
= 312000

175 x 1274 - 175 x 273 - 175
= 175 × (1274 - 273 - 1)
= 175 × 1000
= 175000