0.87×6.53+8点7×0.447-0点八七怎样简便算？
2个回答
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0.87×6.53+8.7×0.447-0.87
=0.87×6.53+0.87×10×0.447-0.87
=0.87×6.53+0.87×(10×0.447)-0.87
=0.87×6.53+0.87×4.47-0.87
=0.87×(6.53+4.47-1)
=0.87×10
=8.7
=0.87×6.53+0.87×10×0.447-0.87
=0.87×6.53+0.87×(10×0.447)-0.87
=0.87×6.53+0.87×4.47-0.87
=0.87×(6.53+4.47-1)
=0.87×10
=8.7
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