《2025年口算训练五年级数学上册人教版双色升级版》

$2.5 × 2.7 × 0.4 =$2.7
$0.4 × (0.25 + 2.5) =$1.1
$125 × (0.8 × 9) =$900
$1.5 × 500 × 0.2 =$150
$50 × 4.8 × 0.2 =$48
$(0.125 + 12.5) × 8 =$101
$(10 + 4) × 0.25 =$3.5
$0.4 × 2.7 × 0.25 =$0.27
$0.5 × (7.6 × 0.2) =$0.76
$20 × (0.1 + 0.05) =$3
$6.7 × 0.25 × 40 =$67
$0.25 × 3.9 × 4 =$3.9
$1.25 × 0.9 × 0.8 =$0.9
$(0.84 + 2.16) × 0.07 =$0.21
$0.25 × (40 + 4) =$11
$80 × 1.25 × 57 =$5700
$0.05 × 7.8 × 0.2 =$0.078
$0.1 × 0.2 × 0.3 =$0.006
$1.57 × 0.2 × 500 =$157
$(1.8 + 8.2) × 0.5 =$5
$3 × 0.8 × 1.25 =$3
$9.6 × 25 + 0.4 × 25 =$250
$2.5 × 0.7 × 0.4 =$0.7
$4 × 1.6 × 0.25 =$1.6
$(2.5 + 0.8) × 0.4 =$1.32
$12.5 × 0.807 × 8 =$80.7
$7 × 1.6 + 7 × 0.4 =$14
$1.2 × 0.8 + 0.8 × 0.8 =$1.6
$8 × (2.5 + 0.25) =$22
$0.8 + 3.4 × 1.25 =$5.05
$7.4 × 0.2 + 2.6 × 0.2 =$2
$0.76 × 0.4 × 0.25 =$0.076
$65 × 0.25 × 4 =$65
$4.9 × 99 + 4.9 =$490
$9.3 × 0.125 × 8 =$9.3
$0.72 × 0.58 + 0.28 × 0.58 =$0.58
$1.25 × (2.5 + 5.5) =$10
$7.06 × 0.5 × 2 =$7.06
$0.75 × (4 + 8) =$9
$5.7 + 4.3 × 0.2 =$6.56
$5.34 × 0.2 × 50 =$53.4
$0.2 × 0.9 × 50 =$9

答案： 解析：这些题目主要考查了小数的四则运算、简便运算以及乘法分配律和结合律的应用。
答案：
$2.5×2.7×0.4$
$=2.5×0.4×2.7$
$=1×2.7$
$=2.7$
$0.4×(0.25+2.5)$
$=0.4×0.25+0.4×2.5$
$=0.1+1$
$=1.1$
$125×(0.8×9)$
$=125×0.8×9$
$=100×9$
$=900$
$1.5×500×0.2$
$=1.5×(500×0.2)$
$=1.5×100$
$=150$
$50×4.8×0.2$
$=50×0.2×4.8$
$=10×4.8$
$=48$
$(0.125+12.5)×8$
$=0.125×8+12.5×8$
$=1+100$
$=101$
$(10+4)×0.25$
$=10×0.25+4×0.25$
$=2.5+1$
$=3.5$
$0.4×2.7×0.25$
$=0.4×0.25×2.7$
$=0.1×2.7$
$=0.27$
$0.5×(7.6×0.2)$
$=0.5×0.2×7.6$
$=0.1×7.6$
$=0.76$
$20×(0.1+0.05)$
$=20×0.1+20×0.05$
$=2+1$
$=3$
$6.7×0.25×40$
$=6.7×(0.25×40)$
$=6.7×10$
$=67$
$0.25×3.9×4$
$=0.25×4×3.9$
$=1×3.9$
$=3.9$
$1.25×0.9×0.8$
$=1.25×0.8×0.9$
$=1×0.9$
$=0.9$
$(0.84+2.16)×0.07$
$=3×0.07$
$=0.21$
$0.25×(40+4)$
$=0.25×40+0.25×4$
$=10+1$
$=11$
$80×1.25×57$
$=100×57$
$=5700$
$0.05×7.8×0.2$
$=0.05×0.2×7.8$
$=0.01×7.8$
$=0.078$
$0.1×0.2×0.3$
$=0.02×0.3$
$=0.006$
$1.57×0.2×500$
$=1.57×(0.2×500)$
$=1.57×100$
$=157$
$(1.8+8.2)×0.5$
$=10×0.5$
$=5$
$3×0.8×1.25$
$=3×(0.8×1.25)$
$=3×1$
$=3$
$9.6×25+0.4×25$
$=(9.6+0.4)×25$
$=10×25$
$=250$
$2.5×0.7×0.4$
$=2.5×0.4×0.7$
$=1×0.7$
$=0.7$
$4×1.6×0.25$
$=4×0.25×1.6$
$=1×1.6$
$=1.6$
$(2.5+0.8)×0.4$
$=2.5×0.4+0.8×0.4$
$=1+0.32$
$=1.32$
$12.5×0.807×8$
$=12.5×8×0.807$
$=100×0.807$
$=80.7$
$7×1.6+7×0.4$
$=7×(1.6+0.4)$
$=7×2$
$=14$
$1.2×0.8+0.8×0.8$
$=0.8×(1.2+0.8)$
$=0.8×2$
$=1.6$
$8×(2.5+0.25)$
$=8×2.5+8×0.25$
$=20+2$
$=22$
$0.8+3.4×1.25$
$=0.8+4.25$
$=5.05$
$7.4×0.2+2.6×0.2$
$=(7.4+2.6)×0.2$
$=10×0.2$
$=2$
$0.76×0.4×0.25$
$=0.76×(0.4×0.25)$
$=0.76×0.1$
$=0.076$
$65×0.25×4$
$=65×(0.25×4)$
$=65×1$
$=65$
$4.9×99+4.9$
$=4.9×(99+1)$
$=4.9×100$
$=490$
$9.3×0.125×8$
$=9.3×(0.125×8)$
$=9.3×1$
$=9.3$
$0.72×0.58+0.28×0.58$
$=(0.72+0.28)×0.58$
$=1×0.58$
$=0.58$
$1.25×(2.5+5.5)$
$=1.25×8$
$=10$
$7.06×0.5×2$
$=7.06×(0.5×2)$
$=7.06×1$
$=7.06$
$0.75×(4+8)$
$=0.75×4+0.75×8$
$=3+6$
$=9$
$5.7+4.3×0.2$
$=5.7+0.86$
$=6.56$
$5.34×0.2×50$
$=5.34×(0.2×50)$
$=5.34×10$
$=53.4$
$0.2×0.9×50$
$=0.2×50×0.9$
$=10×0.9$
$=9$