①308×16-14874÷37
=4928-402
=4526
②(10/3 +3/4 -21/8 )×1
=10/3 - 15/8
=(8×10-15×3)/8×3
=35/24
③3.5÷5/8 ×5/15
=3.5×8/5×1/3
=5.6×1/3
=28/15
④0.8×2.7+7.3÷15/4
=2.16+146/75
=54/25+146/75
=308/75
⑤9.8÷[28×(1-1/7 )+27/5 ]
=9.8÷【28×6/7+5.4】
=9.8÷(24+5.4)
=9.8÷29.4
=1/3
其实吧,我暂时没发现能简算,很抱歉.
恩恩,不好意思额,的确算错了,现在我改过来了,恩恩