
巧算.(1)12.5×3.9×8(
巧算.(1)12.5×3.9×8(2)4.3×2.5×0.4(3)0.125×6.4(4)36×0.25....
巧算.(1)12.5×3.9×8(2)4.3×2.5×0.4(3)0.125×6.4(4)36×0.25.
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(1)12.5×3.9×8,
=12.5×8×3.9,
=100×3.9,
=390;
(2)4.3×2.5×0.4,
=4.3×(2.5×0.4),
=4.3×1,
=4.3;
(3)0.125×6.4,
=0.125×8×0.8,
=1×0.8,
=0.8;
(4)36×0.25,
=9×4×0.25,
=9×(4×0.25),
=9×1,
=9.
=12.5×8×3.9,
=100×3.9,
=390;
(2)4.3×2.5×0.4,
=4.3×(2.5×0.4),
=4.3×1,
=4.3;
(3)0.125×6.4,
=0.125×8×0.8,
=1×0.8,
=0.8;
(4)36×0.25,
=9×4×0.25,
=9×(4×0.25),
=9×1,
=9.
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