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一、口算。
$5.6÷2.8=$
$2.5×0.3=$
$4.68+2.5=$
$9.09÷0.9=$
$9.6÷0.8=$
$2.68+1.42=$
$1.1÷0.55=$
$13.8-2.9=$
$5.6÷2.8=$
2
$2.1×0.7=$1.47
$12.8-4.9-5.1=$2.8
$2.5×0.3=$
0.75
$4.78÷0.2=$23.9
$0.25×4×3.2=$3.2
$4.68+2.5=$
7.18
$9.4×0.2=$1.88
$(1.25-0.125)×8=$9
$9.09÷0.9=$
10.1
$10÷0.25=$40
$3.52÷2.5÷0.4=$3.52
$9.6÷0.8=$
12
$2.85×40=$114
$12.75-(2.75+6.8)=$3.2
$2.68+1.42=$
4.1
$3.6÷1.5=$2.4
$4.7×(3.5-0.5)=$14.1
$1.1÷0.55=$
2
$3.7×0.5=$1.85
$20-6.25×2=$7.5
$13.8-2.9=$
10.9
$1.23+3.4=$4.63
$1.8÷0.9×0.5=$1
答案
2 1.47 2.8 0.75 23.9 3.2 7.18 1.88 9 10.1 40 3.52 12 114 3.2 4.1 2.4 14.1 2 1.85 7.5 10.9 4.63 1
二、计算下面各题,怎样简便就怎样计算。
$(8.1+2.32)×3.6-2.78$ $8.32×3.4+8.32×6.6$
$0.84×0.25+0.06÷4$ $(80.82-74.07)÷1.5×3$
$(8.1+2.32)×3.6-2.78$ $8.32×3.4+8.32×6.6$
$0.84×0.25+0.06÷4$ $(80.82-74.07)÷1.5×3$
答案
34.732 83.2 0.225 13.5
解析
$(8.1+2.32)×3.6-2.78$
$=10.42×3.6-2.78$
$=37.512-2.78$
$=34.732$
$8.32×3.4+8.32×6.6$
$=8.32×(3.4+6.6)$
$=8.32×10$
$=83.2$
$0.84×0.25+0.06÷4$
$=0.84×0.25+0.06×0.25$
$=(0.84+0.06)×0.25$
$=0.9×0.25$
$=0.225$
$(80.82-74.07)÷1.5×3$
$=6.75÷1.5×3$
$=4.5×3$
$=13.5$
$=10.42×3.6-2.78$
$=37.512-2.78$
$=34.732$
$8.32×3.4+8.32×6.6$
$=8.32×(3.4+6.6)$
$=8.32×10$
$=83.2$
$0.84×0.25+0.06÷4$
$=0.84×0.25+0.06×0.25$
$=(0.84+0.06)×0.25$
$=0.9×0.25$
$=0.225$
$(80.82-74.07)÷1.5×3$
$=6.75÷1.5×3$
$=4.5×3$
$=13.5$
