直接写出得数．30×4=32÷5=57+32=400×8=65÷7=6×500=60÷8=730-510=70×6=34÷9=46+26=1-19=47+17=410+510=68-28=512+391≈805-611≈421×5≈76×8≈688×4≈

Question

直接写出得数．

30×4=	32÷5=	57+32=	400×8=	65÷7=
6×500=	60÷8=	730-510=	70×6=	34÷9=
(4)/(6)+(2)/(6)=	1-(1)/(9)=	(4)/(7)+(1)/(7)=	(4)/(10)+(5)/(10)=	(6)/(8)-(2)/(8)=
512+391≈	805-611≈	421×5≈	76×8≈	688×4≈

Answer 1

30×4=120	32÷5=6.4	57+32=89	400×8=3200	65÷7=9(2)/(7)
6×500=3000	60÷8=7.5	730-510=220	70×6=420	34÷9=3(7)/(9)
(4)/(6)+(2)/(6)=1	1-(1)/(9)=(8)/(9)	(4)/(7)+(1)/(7)=(5)/(7)	(4)/(10)+(5)/(10)=(9)/(10)	(6)/(8)-(2)/(8)=(1)/(2)
512+391≈900	805-611≈200	421×5≈2000	76×8≈640	688×4≈2800