用简便方法计算. 99×2.45 5.6÷1.6 1.25×32+215×9.76×0 9.85×2.3-8.85×2.3.
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(1)99×2.45,
=(100-1)×2.45,
=245-2.45,
=242.55;
(2)5.6÷1.6,
=5.6÷(4×0.4),
=5.6÷4÷0.4,
=1.4÷0.4,
=3.5;
(3)1.25×32+215×9.76×0,
=(1.25×8)×4+0,
=10×4,
=40;
(4)9.85×2.3-8.85×2.3,
=(9.85-8.85)×2.3,
=1×2.3,
=2.3.
=(100-1)×2.45,
=245-2.45,
=242.55;
(2)5.6÷1.6,
=5.6÷(4×0.4),
=5.6÷4÷0.4,
=1.4÷0.4,
=3.5;
(3)1.25×32+215×9.76×0,
=(1.25×8)×4+0,
=10×4,
=40;
(4)9.85×2.3-8.85×2.3,
=(9.85-8.85)×2.3,
=1×2.3,
=2.3.
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