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一、口算。
$10÷0.25=$
$2.85×40=$
$3.6÷1.5=$
$3.7×0.5=$
$1.23+3.4=$
$2.1×0.7=$
$4.78÷0.2=$
$9.4×0.2=$
$10÷0.25=$
40
$2.68+1.42=$4.1
$3.52÷2.5÷0.4=$3.52
$2.85×40=$
114
$1.1÷0.55=$2
$12.75-(2.75+6.8)=$3.2
$3.6÷1.5=$
2.4
$13.8-2.9=$10.9
$4.7×(3.5-0.5)=$14.1
$3.7×0.5=$
1.85
$5.6÷2.8=$2
$12.8-4.9-5.1=$2.8
$1.23+3.4=$
4.63
$2.5×0.3=$0.75
$0.25×4×3.2=$3.2
$2.1×0.7=$
1.47
$4.68+2.5=$7.18
$(1.25-0.125)×8=$9
$4.78÷0.2=$
23.9
$9.09÷0.9=$10.1
$1.8÷0.9×0.5=$1
$9.4×0.2=$
1.88
$9.6÷0.8=$12
$20-6.25×2=$7.5
答案
一、40 4.1 3.52 114 2 3.2 2.4 10.9 14.1 1.85 2 2.8 4.63 0.75 3.2 1.47 7.18 9 23.9 10.1 1 1.88 12 7.5
二、计算下面各题,怎样简便就怎样计算。
$0.25×32×1.25$ $17.82+[0.75×(4.5+3.55)]$
$17.3×99+0.173×100$ $39.1÷[0.3÷(11.4+3.6)]$
$0.25×32×1.25$ $17.82+[0.75×(4.5+3.55)]$
$17.3×99+0.173×100$ $39.1÷[0.3÷(11.4+3.6)]$
答案
二、10 23.8575 1730 1955
解析
$0.25×32×1.25$
$=0.25×4×8×1.25$
$=(0.25×4)×(8×1.25)$
$=1×10$
$=10$
$17.82+[0.75×(4.5+3.55)]$
$=17.82+[0.75×8.05]$
$=17.82+6.0375$
$=23.8575$
$17.3×99+0.173×100$
$=17.3×99+17.3×1$
$=17.3×(99+1)$
$=17.3×100$
$=1730$
$39.1÷[0.3÷(11.4+3.6)]$
$=39.1÷[0.3÷15]$
$=39.1÷0.02$
$=1955$
$=0.25×4×8×1.25$
$=(0.25×4)×(8×1.25)$
$=1×10$
$=10$
$17.82+[0.75×(4.5+3.55)]$
$=17.82+[0.75×8.05]$
$=17.82+6.0375$
$=23.8575$
$17.3×99+0.173×100$
$=17.3×99+17.3×1$
$=17.3×(99+1)$
$=17.3×100$
$=1730$
$39.1÷[0.3÷(11.4+3.6)]$
$=39.1÷[0.3÷15]$
$=39.1÷0.02$
$=1955$
