直接写得数．900×6=70×7=80×9=60×5=720÷8=630÷9=250÷5=420÷7=58×6≈79×4≈37×7≈313×9≈58-28=15+25=910-510=1-27=67-37=1112-512=49+59=713+513=

Question

直接写得数．

900×6=	70×7=	80×9=	60×5=
720÷8=	630÷9=	250÷5=	420÷7=
58×6≈	79×4≈	37×7≈	313×9≈
(5)/(8)-(2)/(8)=	(1)/(5)+(2)/(5)=	(9)/(10)-(5)/(10)=	1-(2)/(7)=
(6)/(7)-(3)/(7)=	(11)/(12)-(5)/(12)=	(4)/(9)+(5)/(9)=	(7)/(13)+(5)/(13)=

Answer 1

900×6=5400	70×7=490	80×9=720	60×5=300
720÷8=90	630÷9=70	250÷5=50	420÷7=60
58×6≈3600	79×4≈3200	37×7≈280	313×9≈2700
(5)/(8)-(2)/(8)=(3)/(8)	(1)/(5)+(2)/(5)=(3)/(5)	(9)/(10)-(5)/(10)=(2)/(5)	1-(2)/(7)=(5)/(7)
(6)/(7)-(3)/(7)=(3)/(7)	(11)/(12)-(5)/(12)=(1)/(2)	(4)/(9)+(5)/(9)=1	(7)/(13)+(5)/(13)=(12)/(13)