能巧算的要巧算.(1)7.2×1.25(2)9.9×26(3)

2025-02-27 12:52:19
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回答1:

(1)7.2×1.25,
=9×0.8×1.25,
=9×(0.8×1.25),
=9×1,
=9;

(2)9.9×26,
=(10-0.1)×26,
=10×2.6-0.1×26,
=26-2.6,
=23.4;

(3)36.7÷25,
=(36.7×4)÷(25×4),
=146.8÷100,
=1.468;

(4)19.25-6.25÷2.5,
=19.25-2.5,
=16.75;

(5)19.12÷0.8+3.4,
=23.9+3.4,
=27.3.