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+0.7×(5.09-1)
=50.9+0.7×4.09
=50.9+2.863
=53.763
=5.09×(10+0.7)-0.7
=5.09×10+5.09×0.7-0.7
=50.9+0.7×(5.09-1)
=50.9+0.7×4.09
=50.9+2.863
=53.763
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5.09×10.7-0.7=(509×107-700)╱1000=(509×100+509×7-700)╱1000=(50900+3563-700)╱1000=(50200+3563)╱1000=53763╱1000=53.763
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5.09×10.7-0.7
原式=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
原式=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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=5.09×(10+0.7)-0.7
=5.09×10+0.7×5.09-0.7
=50.9+0.7×4.09
=50.9+2.863
=53.763
=5.09×10+0.7×5.09-0.7
=50.9+0.7×4.09
=50.9+2.863
=53.763
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原式=(5+0.1-0.01)×10.7-0.7
=53.5+1.07-0.107-0.7
=53.5+0.37-0.107
=53.5+0.263
=53.763
=53.5+1.07-0.107-0.7
=53.5+0.37-0.107
=53.5+0.263
=53.763
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