《2025年口算训练五年级数学上册人教版双色升级版》

$1.25×0.4=$
$0.48÷0.8=$
$7.1+0.29=$
$4.2×0.2=$
$4×1.8=$
$0÷31.5=$
$0.77÷10=$
$8.56×0.1=$
$1.8-0.18=$
$4.5÷0.45=$
$0.9÷0.9+0.9=$
$0.42÷0.1×0=$
$0.7+0.7÷0.7=$
$12-3.8×2=$
$1.5×0.8=$
$1.7×0.3+1=$
$1.05×5+5=$
$1.4×0.2+0.72=$
$2.28÷0.3-0.3=$
$3.69×3÷0.9=$
$0.9×0.3+0.7=$

答案： 解析：这些题目主要考查小数的四则运算，包括乘法、除法、加法和减法，以及混合运算。
答案：
$1.25×0.4=0.5$
$0.48÷0.8=0.6$
$7.1+0.29=7.39$
$4.2×0.2=0.84$
$4×1.8=7.2$
$0÷31.5=0$
$0.77÷10=0.077$
$8.56×0.1=0.856$
$1.8-0.18=1.62$
$4.5÷0.45=10$
$0.9÷0.9+0.9=1+0.9=1.9$
$0.42÷0.1×0=0$
$0.7+0.7÷0.7=0.7+1=1.7$
$12-3.8×2=12-7.6=4.4$
$1.5×0.8=1.2$
$1.7×0.3+1=0.51+1=1.51$
$1.05×5+5=5.25+5=10.25$
$1.4×0.2+0.72=0.28+0.72=1$
$2.28÷0.3-0.3=7.6-0.3=7.3$
$3.69×3÷0.9=11.07÷0.9=12.3$
$0.9×0.3+0.7=0.27+0.7=0.97$

$(4.8+5.2)×0.5=$5
$4×0.8×1.25=$4
$(30+3)×0.2=$6.6
$0.25×(80+8)=$22
$(20+4)×0.25=$6
$30×0.8×0.2=$4.8
$1.25×(0.8×0.7)=$0.7
$2.5×3.1×0.4=$3.1
$7.3×0.125×8=$7.3
$0.75×25×4=$75
$2.5×(8+0.4)=$21
$125×(0.8×7)=$700
$(1.6+8.4)×0.6=$6
$7.2×8×12.5=$720
$0.8×(0.25+2.5)=$2.2
$(0.125+12.5)×8=$101
$(0.06+0.1)×30=$4.8
$(3.17+0.83)×0.06=$0.24
$(3.9+0.3)×0.05=$0.21
$12.5×(8.2+1.8)=$125
$2.4×5×0.4=$4.8

答案： $(4.8+5.2)×0.5=10×0.5=5$
$4×0.8×1.25=4×(0.8×1.25)=4×1=4$
$(30+3)×0.2=30×0.2 + 3×0.2=6 + 0.6=6.6$
$0.25×(80+8)=0.25×80 + 0.25×8=20 + 2=22$
$(20+4)×0.25=20×0.25 + 4×0.25=5 + 1=6$
$30×0.8×0.2=30×(0.8×0.2)=30×0.16=4.8$
$1.25×(0.8×0.7)=(1.25×0.8)×0.7=1×0.7=0.7$
$2.5×3.1×0.4=(2.5×0.4)×3.1=1×3.1=3.1$
$7.3×0.125×8=7.3×(0.125×8)=7.3×1=7.3$
$0.75×25×4=0.75×(25×4)=0.75×100=75$
$2.5×(8+0.4)=2.5×8 + 2.5×0.4=20 + 1=21$
$125×(0.8×7)=(125×0.8)×7=100×7=700$
$(1.6+8.4)×0.6=10×0.6=6$
$7.2×8×12.5=7.2×(8×12.5)=7.2×100=720$
$0.8×(0.25+2.5)=0.8×0.25 + 0.8×2.5=0.2 + 2=2.2$
$(0.125+12.5)×8=0.125×8 + 12.5×8=1 + 100=101$
$(0.06+0.1)×30=0.16×30=4.8$
$(3.17+0.83)×0.06=4×0.06=0.24$
$(3.9+0.3)×0.05=4.2×0.05=0.21$
$12.5×(8.2+1.8)=12.5×10=125$
$2.4×5×0.4=2.4×(5×0.4)=2.4×2=4.8$