《2025年口算训练宁波出版社六年级数学上册人教版》

$3.14×3=$9.42 $1^2=$1
$3.14×5=$15.7 $2^2=$4
$3.14×7=$21.98 $3^2=$9
$3.14×2=$6.28 $4^2=$16
$3.14×10=$31.4 $5^2=$25
$3.14×4=$12.56 $6^2=$36
$3.14×6=$18.84 $7^2=$49
$3.14×8=$25.12 $8^2=$64
$3.14×9=$28.26 $9^2=$81
$3.14×40=$125.6 $10^2=$100
$3.14×50=$157 $11^2=$121
$3.14×20=$62.8 $12^2=$144
$3.14×90=$282.6 $13^2=$169
$8.7×2=$17.4 $14^2=$196
$100÷5=$20 $15^2=$225
$9.5×2=$19 $20^2=$400
$12.4÷2=$6.2 $30^2=$900
$4.7÷2=$2.35 $40^2=$1600
$5.7×2=$11.4 $50^2=$2500
$3.8÷2=$1.9 $60^2=$3600

答案： $3.14×3=9.42$ $1^2=1$
$3.14×5=15.7$ $2^2=4$
$3.14×7=21.98$ $3^2=9$
$3.14×2=6.28$ $4^2=16$
$3.14×10=31.4$ $5^2=25$
$3.14×4=12.56$ $6^2=36$
$3.14×6=18.84$ $7^2=49$
$3.14×8=25.12$ $8^2=64$
$3.14×9=28.26$ $9^2=81$
$3.14×40=125.6$ $10^2=100$
$3.14×50=157$ $11^2=121$
$3.14×20=62.8$ $12^2=144$
$3.14×90=282.6$ $13^2=169$
$8.7×2=17.4$ $14^2=196$
$100÷5=20$ $15^2=225$
$9.5×2=19$ $20^2=400$
$12.4÷2=6.2$ $30^2=900$
$4.7÷2=2.35$ $40^2=1600$
$5.7×2=11.4$ $50^2=2500$
$3.8÷2=1.9$ $60^2=3600$