用简便方法计算5-94÷458-354.9×6.4+14×0.36-6.4×3.5.
方法
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| 用简便方法计算 5- 4.9×6.4+14×0.36-6.4×3.5. |
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(1)5-94÷458-35,
=5-94×845-35,
=5-25-35,
=5-(25+35),
=5-1,
=4;
(2)4.9×6.4+14×0.36-6.4×3.5,
=(4.9-3.5)×6.4+14×0.36,
=1.4×6.4+14×0.36,
=1.4×6.4+1.4×3.6,
=1.4×(6.4+3.6),
=1.4×10,
=14.
