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一、口算。
$0.12×0.7=$
$0.2×60=$
$200×0.04=$
$2.5-1.37=$
$3.4+4.6=$
$55-5.5=$
$2.6×0.3=$
$9.7-6.9=$
$0.12×0.7=$
0.084
$3.6÷0.09=$40
$10.8÷0.36=$30
$0.2×60=$
12
$0.21×0.3=$0.063
$0.4÷0.8=$0.5
$200×0.04=$
8
$8.2÷0.01=$820
$14.7÷0.7=$21
$2.5-1.37=$
1.13
$169÷1.3=$130
$6.6÷0.3=$22
$3.4+4.6=$
8
$14.8+2.2=$17
$14.6+24=$38.6
$55-5.5=$
49.5
$2.4×40=$96
$3.26÷0.2=$16.3
$2.6×0.3=$
0.78
$1-0.02=$0.98
$0.72÷2.4=$0.3
$9.7-6.9=$
2.8
$2.52÷0.4=$6.3
$12.1÷11=$1.1
答案
0.084 40 30 12 0.063 0.5 8 820 21 1.13 130 22 8 17 38.6 49.5 96 16.3 0.78 0.98 0.3 2.8 6.3 1.1
二、计算下面各题,怎样简便就怎样计算。
$5.4×0.56+5.6×0.46$ $[10.4+(5.2+4.8)]×2.1$
$13.5+(21.5÷2.5-0.09)$ $0.96+11.87+5.04-3.87$
$5.4×0.56+5.6×0.46$ $[10.4+(5.2+4.8)]×2.1$
$13.5+(21.5÷2.5-0.09)$ $0.96+11.87+5.04-3.87$
答案
5.6 42.84 22.01 14
解析
$5.4×0.56+5.6×0.46$
$=5.4×0.56+0.56×4.6$
$=0.56×(5.4+4.6)$
$=0.56×10$
$=5.6$
$[10.4+(5.2+4.8)]×2.1$
$=[10.4+10]×2.1$
$=20.4×2.1$
$=42.84$
$13.5+(21.5÷2.5-0.09)$
$=13.5+(8.6-0.09)$
$=13.5+8.51$
$=22.01$
$0.96+11.87+5.04-3.87$
$=(0.96+5.04)+(11.87-3.87)$
$=6+8$
$=14$
$=5.4×0.56+0.56×4.6$
$=0.56×(5.4+4.6)$
$=0.56×10$
$=5.6$
$[10.4+(5.2+4.8)]×2.1$
$=[10.4+10]×2.1$
$=20.4×2.1$
$=42.84$
$13.5+(21.5÷2.5-0.09)$
$=13.5+(8.6-0.09)$
$=13.5+8.51$
$=22.01$
$0.96+11.87+5.04-3.87$
$=(0.96+5.04)+(11.87-3.87)$
$=6+8$
$=14$
