5.09×10.7-0.7该怎么简便运算?
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5.09×10.7-0.7
=5.09×(10+0.7)-0.7
=5.09×10+5.09×0.7-0.7
=50.9+(5.09-1)×0.7
=50.9+4.09×0.7
=50.9+(4+0.09)×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063
=53.763
=5.09×(10+0.7)-0.7
=5.09×10+5.09×0.7-0.7
=50.9+(5.09-1)×0.7
=50.9+4.09×0.7
=50.9+(4+0.09)×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063
=53.763
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5.09×10.7-0.7简便运算:
5.09×10.7-0.7
=5.09×(10+0.7)-0.7
=50.9+5.09×0.7-0.7
=50.9+4.09×0.7
=50.9+2.863
=53.763
5.09×10.7-0.7
=5.09×(10+0.7)-0.7
=50.9+5.09×0.7-0.7
=50.9+4.09×0.7
=50.9+2.863
=53.763
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展开全部
5.09×10.7-0.7
=5.09×(10+0.7)-0.7
=5.09×10+5.09×0.7-0.7
=50.9+(5.09-1)×0.7
=50.9+4.09×0.7
=50.9+(4+0.09)×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063=53.763
=5.09×(10+0.7)-0.7
=5.09×10+5.09×0.7-0.7
=50.9+(5.09-1)×0.7
=50.9+4.09×0.7
=50.9+(4+0.09)×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063=53.763
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