巧算:『125x41』x8=?540x31÷270=?808x125=?
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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