心算

60÷3=________	1.4-0.8=________	300÷6=________	140÷2=________
46+38=________	240÷6=________	1800÷9=________	4200÷7=________
46÷2=________	330-70=________	125×8=________	72÷9=________
606÷3=________	150÷5=________	630÷9=________	300-300÷6=________
16×20=________	4.1+0.8=________	50×16=________	13×3=________
14×20=________	0÷11=________	20×60=________	19×20=________
86-68=________	30×12=________	20×40=________	330-70=________
80×9=________	11×60=________	12×20=________	18×40=________
33×30=________	9-4.8=________	3.6-1.8=________	6.7+2.5=________
24÷4=________	80-6=________	60÷4=________	4+28=________
25+75=________	0.6+1.5=________	15×50=________	141÷3=________
91÷7=________	3×4×5=________	137-67=________	380×10=________
50×50=________	26÷2=________	6.2+3.9=________	783÷6=________
804÷2=________	7×0=________	780-70=________	2407+3=________
707÷7=________	760-250=________	8.4-7.5=________	147÷7=________．

200.650708440200600232601000820230702503204.98003928001200380183608002607206602407209904.21.89.267415321002.175047136070380025001310.1130.5402071024101015100.921
分析：根据整数加减乘除四则运算的法则求解．
解答：

60÷3=20	1.4-0.8=0.6	300÷6=50	140÷2=70
46+38=84	240÷6=40	1800÷9=200	4200÷7=600
46÷2=23	330-70=260	125×8=1000	72÷9=8
606÷3=202	150÷5=30	630÷9=70	300-300÷6=250
16×20=320	4.1+0.8=4.9	50×16=800	13×3=39
14×20=280	0÷11=0	20×60=1200	19×20=380
86-68=18	30×12=360	20×40=800	330-70=260
80×9=720	11×60=660	12×20=240	18×40=720
33×30=990	9-4.8=4.2	3.6-1.8=1.8	6.7+2.5=9.2
24÷4=6	80-6=74	60÷4=15	4+28=32
25+75=100	0.6+1.5=2.1	15×50=750	141÷3=47
91÷7=13	3×4×5=60	137-67=70	380×10=3800
50×50=2500	26÷2=13	6.2+3.9=10.1	783÷6=130.5
804÷2=402	7×0=0	780-70=710	2407+3=2410
707÷7=101	760-250=510	8.4-7.5=0.9	147÷7=21．

点评：本题考查了基本的运算，计算时要细心，做到快速、准确．