(4.8+0.12)*0.4简便运算？
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(4.8+0.12)*0.4
=(5-0.2+0.12)*0.4
=5*0.4-0.08*0.4
=2-0.032
=1.968
=(5-0.2+0.12)*0.4
=5*0.4-0.08*0.4
=2-0.032
=1.968
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书写如下：
(4.8+0.12)×0.4
=4.92×0.4
=(5-0.08)×0.4
=5×0.4-0.08×0.4
=2-0.032
=1.968
(4.8+0.12)×0.4
=4.92×0.4
=(5-0.08)×0.4
=5×0.4-0.08×0.4
=2-0.032
=1.968
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