Question

巧算12345×2345+2469×38275

Answer 1

利用乘法分配律和结合律，可以写成：

12345 × 2345 + 2469 × 38275
= 12345 × (2000 + 345) + 2469 × (40000 + 38275)
= 12345 × 2000 + 12345 × 345 + 2469 × 40000 + 2469 × 38275
= 24,690,000 + 4,259,025 + 98,760,000 + 94,012,475
= 221,721,500

因此，巧算 12345 × 2345 + 2469 × 38275 的结果为 221,721,500。

Answer 2

12345x2345十2469x38275
=12345X2345十2469x(5x7655)
=12345X2345十2469x5X7655
=12345X2345十12345X7655
=12345X(2345十7655)
=12345X10000
=123450000