巧算：『125x41』x8=?540x31÷270=?808x125=?

巧算：『125x41』x8=?540x31÷270=?808x125=?
巧算：
『125x41』x8=?
540x31÷270=?
808x125=?

巧算：『125x41』x8=?540x31÷270=?808x125=?
(125×41)×8
= （125 ×8）×41
= 1000 ×41
= 41000

540×31 ÷ 270
= 540 ÷270 ×31
= 2 × 31
= 62

808 ×125
= 101 ×（8 × 125）
= 101 ×1000
= 101000