用递等式进行计算,能简便的要简便简便计算.7.29×4.6+46×1.271 (28.7-18.6÷3.1)×0.8 &n...
用递等式进行计算,能简便的要简便简便计算.7.29×4.6+46×1.271(28.7-18.6÷3.1)×0.816-5.32-4.6840.8+14.7÷(14.6-...
用递等式进行计算,能简便的要简便简便计算.7.29×4.6+46×1.271 (28.7-18.6÷3.1)×0.8 16-5.32-4.6840.8+14.7÷(14.6-12.5)3.7×0.125+6.3÷8 0.72+9.6÷3.2.
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(1)7.29×4.6+46×1.271,
=7.29×4.6+4.6×12.71,
=(7.29+12.71)×4.6,
=20×4.6,
=92;
(2)(28.7-18.6÷3.1)×0.8,
=(28.7-6)×0.8,
=22.7×0.8,
=18.16;
(3)16-5.32-4.68,
=16-(5.32+4.68),
=16-10,
=6;
(4)40.8+14.7÷(14.6-12.5),
=40.8+14.7÷2.1,
=40.8+7,
=47.8;
(5)3.7×0.125+6.3÷8,
=3.7×0.125+6.3×
,
=(3.7+6.3)×0.125,
=1.25;
(6)0.72+9.6÷3.2,
=0.72+3,
=3.72.
=7.29×4.6+4.6×12.71,
=(7.29+12.71)×4.6,
=20×4.6,
=92;
(2)(28.7-18.6÷3.1)×0.8,
=(28.7-6)×0.8,
=22.7×0.8,
=18.16;
(3)16-5.32-4.68,
=16-(5.32+4.68),
=16-10,
=6;
(4)40.8+14.7÷(14.6-12.5),
=40.8+14.7÷2.1,
=40.8+7,
=47.8;
(5)3.7×0.125+6.3÷8,
=3.7×0.125+6.3×
1 |
8 |
=(3.7+6.3)×0.125,
=1.25;
(6)0.72+9.6÷3.2,
=0.72+3,
=3.72.
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