《2025年口算训练五年级数学上册人教版双色升级版》

$2.7×2=$
$2.7×0.02=$
$0.5×0.9=$
$0.36×4=$
$3.6×0.4=$
$1.2×0.5=$
$4.5×0.2=$
$0.45×20=$
$0.18×4=$
$1.8×0.4=$
$9.5×2=$
$9.5×0.2=$
$487×0.01=$
$5.9×0.2=$
$0.26×0.3=$
$26×0.03=$
$42×0.04=$
$4.2×0.4=$
$2.4×0.05=$
$24×0.5=$
$0.24×0.5=$

答案： 解析：这些题目都是基础的小数乘法口算题，主要考察小数乘法的计算法则和精度处理。
答案：
$2.7 × 2 = 5.4$
$2.7 × 0.02 = 0.054$
$0.5 × 0.9 = 0.45$
$0.36 × 4 = 1.44$
$3.6 × 0.4 = 1.44$
$1.2 × 0.5 = 0.6$
$4.5 × 0.2 = 0.9$
$0.45 × 20 = 9$
$0.18 × 4 = 0.72$
$1.8 × 0.4 = 0.72$
$9.5 × 2 = 19$
$9.5 × 0.2 = 1.9$
$487 × 0.01 = 4.87$
$5.9 × 0.2 = 1.18$
$0.26 × 0.3 = 0.078$
$26 × 0.03 = 0.78$
$42 × 0.04 = 1.68$
$4.2 × 0.4 = 1.68$
$2.4 × 0.05 = 0.12$
$24 × 0.5 = 12$
$0.24 × 0.5 = 0.12$

$50×0.02=$
$5×0.2=$
$0.5×200=$
$0.5×0.02=$
$0.98×1000=$
$0.13×7=$
$7.8×0.2=$
$56×0.01=$
$1.7×0.03=$
$4.6×0.5=$
$0.46×5=$
$7.4×0.2=$
$74×0.02=$
$1.9×0.04=$
$19×4=$
$0.27×3=$
$0.27×0.3=$
$6.2×0.2=$
$6.2×0.02=$
$0.62×0.2=$
$0.062×0.02=$

答案： 解析：这些题目都是基础的数学乘法运算，主要考察的是小数乘法的计算能力。我们只需要按照乘法运算的规则，将每一个式子中的两个数相乘即可。
答案：
$50×0.02=1$
$5×0.2=1$
$0.5×200=100$
$0.5×0.02=0.01$
$0.98×1000=980$
$0.13×7=0.91$
$7.8×0.2=1.56$
$56×0.01=0.56$
$1.7×0.03=0.051$
$4.6×0.5=2.3$
$0.46×5=2.3$
$7.4×0.2=1.48$
$74×0.02=1.48$
$1.9×0.04=0.076$
$19×4=76$
$0.27×3=0.81$
$0.27×0.3=0.081$
$6.2×0.2=1.24$
$6.2×0.02=0.124$
$0.62×0.2=0.124$
$0.062×0.02=0.00124$

$12×0.6=$7.2
$1.2×0.6=$0.72
$0.12×0.6=$0.072
$0.12×6=$0.72
$30×0.09=$2.7
$0.125×8=$1
$14×0.6=$8.4
$3.5×0.2=$0.7
$76×0.01=$0.76
$0.74×2=$1.48
$2.3×0.4=$0.92
$0.58×0.1=$0.058
$80×1.25=$100
$1.4×0.5=$0.7
$21×0.04=$0.84
$4.7×0.2=$0.94
$15×0.8=$12
$51×0.5=$25.5
$125×0.008=$1
$73×0.02=$1.46
$0.05×126=$6.3

答案： 解析：这些题目都是基础的乘法口算题，涉及到小数与整数、小数与小数的乘法运算。
答案：
$12×0.6=7.2$
$1.2×0.6=0.72$
$0.12×0.6=0.072$
$0.12×6=0.72$
$30×0.09=2.7$
$0.125×8=1$
$14×0.6=8.4$
$3.5×0.2=0.7$
$76×0.01=0.76$
$0.74×2=1.48$
$2.3×0.4=0.92$
$0.58×0.1=0.058$
$80×1.25=100$
$1.4×0.5=0.7$
$21×0.04=0.84$
$4.7×0.2=0.94$
$15×0.8=12$
$51×0.5=25.5$
$125×0.008=1$
$73×0.02=1.46$
$0.05×126=6.3$