试题:
用递等式计算.
(1)20-2.5×4÷8 (2)6.4×9.9+0.64 (3)5.37×2.5+7.5×5.37
(4)(4.8-4.8×0.5)÷2(5)1.5×1.2-0.6÷2.4 (6)2.5×7.6×4-7.6.

答案:

我来补答
(1)20-2.5×4÷8,
=20-10÷8,
=20-1.25,
=18.75;

(2)6.4×9.9+0.64,
=63.36+0.64,
=64;

(3)5.37×2.5+7.5×5.37,
=5.37×(2.5+7.5),
=5.37×10,
=53.7;

(4)(4.8-4.8×0.5)÷2,
=(4.8-2.4)÷2,
=2.4÷2,
=1.2;

(5)1.5×1.2-0.6÷2.4,
=1.8-0.25,
=1.55;

(6)2.5×7.6×4-7.6,
=(2.5×4)×7.6-7.6,
=10×7.6-7.6,
=76-7.6,
=68.4.
 
 
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