《2025年口算训练五年级数学上册北师大版双色升级版》

$45+5.5÷55=$45.1 $1.7×(0.27÷0.09)=$5.1
$28.6×(0.5÷0.25)=$57.2 $91.9-0.09÷9=$91.89
$5.7×0.3-0.05=$1.66 $0.17÷(0.02÷0.4)=$3.4
$16.2÷0.03÷30=$18 $78.1-1.6×5=$70.1
$73.6-3.6÷2=$71.8 $0.8÷0.04×2.5=$50
$33.7÷10+10=$13.37 $30.8÷4÷77=$0.1
$0.8÷(0.04×2.5)=$8 $(19.5+80.5)÷25=$4

答案： 解析：这些题目主要考察小数的四则运算。
答案：
$45 + 5.5 ÷ 55 = 45 + 0.1 = 45.1$
$1.7 × (0.27 ÷ 0.09) = 1.7 × 3 = 5.1$
$28.6 × (0.5 ÷ 0.25) = 28.6 × 2 = 57.2$
$91.9 - 0.09 ÷ 9 = 91.9 - 0.01 = 91.89$
$5.7 × 0.3 - 0.05 = 1.71 - 0.05 = 1.66$
$0.17 ÷ (0.02 ÷ 0.4) = 0.17 ÷ 0.05 = 3.4$
$16.2 ÷ 0.03 ÷ 30 = 540 ÷ 30 = 18$
$78.1 - 1.6 × 5 = 78.1 - 8 = 70.1$
$73.6 - 3.6 ÷ 2 = 73.6 - 1.8 = 71.8$
$0.8 ÷ 0.04 × 2.5 = 20 × 2.5 = 50$
$33.7 ÷ 10 + 10 = 3.37 + 10 = 13.37$
$30.8 ÷ 4 ÷ 77 = 7.7 ÷ 77 = 0.1$
$0.8 ÷ (0.04 × 2.5) = 0.8 ÷ 0.1 = 8$
$(19.5 + 80.5) ÷ 25 = 100 ÷ 25 = 4$

$80÷(6.4÷0.08)=$1 $6.51+0.49÷0.07=$13.51
$40.9÷4.09×0.01=$0.1 $96.96-0.96÷8=$96.84
$0.45÷0.9×0.05=$0.025 $0.45÷(0.9×0.05)=$10
$(30+6.24)÷6=$6.04 $79.3+3.21÷3=$80.37
$100.7+0.54÷18=$100.73 $5.2÷13×500=$200
$7.5÷2.5÷0.15=$20 $0.6÷0.6×0.6÷0.6=$1
$0.05×600÷1.5=$20 $0.75÷25÷0.3=$0.1
$30+6.24÷6=$31.04 $0.34÷0.17×85=$170

答案： 解析：这些题目主要考查小数的四则运算，包括除法、乘法、加法和减法，以及运算的优先级。
答案：
$80 ÷ (6.4 ÷ 0.08)$
$= 80 ÷ 80$
$= 1$
$6.51 + 0.49 ÷ 0.07$
$= 6.51 + 7$
$= 13.51$
$40.9 ÷ 4.09 × 0.01$
$= 10 × 0.01$
$= 0.1$
$96.96 - 0.96 ÷ 8$
$= 96.96 - 0.12$
$= 96.84$
$0.45 ÷ 0.9 × 0.05$
$= 0.5 × 0.05$
$= 0.025$
$0.45 ÷ (0.9 × 0.05)$
$= 0.45 ÷ 0.045$
$= 10$
$(30 + 6.24) ÷ 6$
$= 36.24 ÷ 6$
$= 6.04$
$79.3 + 3.21 ÷ 3$
$= 79.3 + 1.07$
$= 80.37$
$100.7 + 0.54 ÷ 18$
$= 100.7 + 0.03$
$= 100.73$
$5.2 ÷ 13 × 500$
$= 0.4 × 500$
$= 200$
$7.5 ÷ 2.5 ÷ 0.15$
$= 3 ÷ 0.15$
$= 20$
$0.6 ÷ 0.6 × 0.6 ÷ 0.6$
$= 1 × 1$
$= 1$
$0.05 × 600 ÷ 1.5$
$= 30 ÷ 1.5$
$= 20$
$0.75 ÷ 25 ÷ 0.3$
$= 0.03 ÷ 0.3$
$= 0.1$
$30 + 6.24 ÷ 6$
$= 30 + 1.04$
$= 31.04$
$0.34 ÷ 0.17 × 85$
$= 2 × 85$
$= 170$