39又3/23×0.7+65又5/23×4.18求簡便算灋
39又3/23×0.7+65又5/23×4.18
=39又3/23+65又5/23+65又5/23×0.18-39又3/23×0.3
=104又8/23+13又1/23×0.9-13又1/23×0.9
=104又8/23
65*0.37-6.5*2.7=求簡便算灋?
65*0.37-6.5*2.7
=6.5×3.7-6.5×2.7
=6.5×(3.7-2.7)
=6.5×1
=6.5