巧算 25×125×4×8 27×99+27 38×101 300÷25 125×16 864÷(27-23)×12

巧算 25×125×4×8 27×99+27 38×101 300÷25 125×16 864÷(27-23)×12.

(1)25×125×4×8,
=(25×4)×(125×8),
=100×1000,
=100000;

(2)27×99+27,
=27×(99+1),
=27×100,
=2700;

(3)38×101,
=38×100+38×1,
=3800+38,
=3838;

(4)300÷25,
=(300×4)÷(25×4),
=1200÷100,
=12;

(5)125×16,
=125×8×2,
=1000×2,
=2000;

(6)864÷(27-23)×12,
=864÷4×12,
=216×12,
=2592.

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