3.5-2.5×0.7+2.3用简便方法
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3.5-2.5x0.7十2.3
=5x0.7-2.5x0.7+2.3
=(5一2.5)x0.7+2.3
=2.5xO.7+2.3
=l.75十2.3
=4.05
=5x0.7-2.5x0.7+2.3
=(5一2.5)x0.7+2.3
=2.5xO.7+2.3
=l.75十2.3
=4.05
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展开全部
3.5-2.5x0.7十2.3
=5x0.7-2.5x0.7+2.3
=(5一2.5)x0.7+2.3
=2.5xO.7+2.3
=l.75十2.3
=4.05
=5x0.7-2.5x0.7+2.3
=(5一2.5)x0.7+2.3
=2.5xO.7+2.3
=l.75十2.3
=4.05
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回答:
3.5-2.5×0.7+2.3
=3.5-1.75+2.3
=3.5+2.3-1.75
=5.8-1.75
=4.05
运用了加法结合律
3.5-2.5×0.7+2.3
=3.5-1.75+2.3
=3.5+2.3-1.75
=5.8-1.75
=4.05
运用了加法结合律
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3.5-2.5×0.7+2.3
=3.5-1.75+2.3
=3.5+2.3-1.75
=5.8-1.75
=4.05
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