计算,能简算的要简算.3.2×1.8+2.54198×0.511.

计算,能简算的要简算.3.2×1.8+2.54198×0.511.25×32×2.50.8×72.4×12.55.2×10.12.5×3.7+6.3×2.5.


(1)3.2×1.8+2.54,
=5.76+2.54,
=8.3;

(2)198×0.51,
=(200-2)×0.51,
=200×0.51-2×0.51,
=102-1.02,
=100.98;

(3)1.25×32×2.5,
=1.25×(4×8)×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(4)0.8×72.4×12.5,
=0.8×12.5×72.4,
=10×72.4,
=724;

(5)5.2×10.1,
=5.2×(10+0.1),
=5.2×10+5.2×0.1,
=52+0.52,
=52.52;

(6)2.5×3.7+6.3×2.5,
=2.5×(3.7+6.3),
=2.5×10,
=25.

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计算,能简算的要简算.3.2×1.8+2.54198×0.511.
(1)3.2×1.8+2.54,=5.76+2.54,=8.3;(2)198×0.51,=(200-2)×0.51,=200×0.51-2×0.51,=102-1.02,=100.98;(3)1.25×32×2.5,=1.25×(4×8)×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(4)0.8×72.4×12.5,=0.8×12.5×...

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