《2025年天天练口算五年级数学上册人教版》

4×7.8=31.2
9.34×0.2=1.868
4-0.6÷0.6=3
2.9÷0.1=29
2.05×0.4=0.82
7.5+2.5×4=17.5
8.065÷10=0.8065
0.31×20=6.2
26.4-3.7-6.3=16.4
4.2+23.4=27.6
7.8÷3=2.6
4.2-4.2÷7=3.6
24×0.5=12
0.82÷0.2=4.1
840÷0.25÷4=840
0.38×0.5=0.19
12.4×0.3=3.72
0.8÷2×0.6=0.24
100-20.5=79.5
7.8-4.35=3.45
36-0.2-0.8=35
6.5÷0.65=10
2.4+0.5=2.9
2+0.2×0.5=2.1
0.37×0.4=0.148
1.1×0.4=0.44
2×0.8-1.2=0.4
7.3×0.4=2.92
5.25÷5=1.05
2.4×101-2.4=240
0.28÷0.7=0.4
6.5×0.3=1.95
4.3×0.5+4.3=6.45
5.6÷7=0.8
4.3×2=8.6
7.8+2.5+2.2=12.5
3.2÷8=0.4
0.12×7=0.84
4.5-0.9-0.1=3.5

答案： 解析：这些题目主要考查小数的加减乘除运算，以及运算的优先级。
答案：
$4 × 7.8 = 31.2$
$9.34 × 0.2 = 1.868$
$4 - 0.6 ÷ 0.6 = 4 - 1 = 3$
$2.9 ÷ 0.1 = 29$
$2.05 × 0.4 = 0.82$
$7.5 + 2.5 × 4 = 7.5 + 10 = 17.5$
$8.065 ÷ 10 = 0.8065$
$0.31 × 20 = 6.2$
$26.4 - 3.7 - 6.3 = 26.4 - 10 = 16.4$
$4.2 + 23.4 = 27.6$
$7.8 ÷ 3 = 2.6$
$4.2 - 4.2 ÷ 7 = 4.2 - 0.6 = 3.6$
$24 × 0.5 = 12$
$0.82 ÷ 0.2 = 4.1$
$840 ÷ 0.25 ÷ 4 = 840 ÷ 1 = 840$
$0.38 × 0.5 = 0.19$
$12.4 × 0.3 = 3.72$
$0.8 ÷ 2 × 0.6 = 0.4 × 0.6 = 0.24$
$100 - 20.5 = 79.5$
$7.8 - 4.35 = 3.45$
$36 - 0.2 - 0.8 = 36 - 1 = 35$
$6.5 ÷ 0.65 = 10$
$2.4 + 0.5 = 2.9$
$2 + 0.2 × 0.5 = 2 + 0.1 = 2.1$
$0.37 × 0.4 = 0.148$
$1.1 × 0.4 = 0.44$
$2 × 0.8 - 1.2 = 1.6 - 1.2 = 0.4$
$7.3 × 0.4 = 2.92$
$5.25 ÷ 5 = 1.05$
$2.4 × 101 - 2.4 = 2.4 × (101 - 1) = 2.4 × 100 = 240$
$0.28 ÷ 0.7 = 0.4$
$6.5 × 0.3 = 1.95$
$4.3 × 0.5 + 4.3 = 4.3 × (0.5 + 1) = 4.3 × 1.5 = 6.45$
$5.6 ÷ 7 = 0.8$
$4.3 × 2 = 8.6$
$7.8 + 2.5 + 2.2 = 7.8 + 2.2 + 2.5 = 10 + 2.5 = 12.5$
$3.2 ÷ 8 = 0.4$
$0.12 × 7 = 0.84$
$4.5 - 0.9 - 0.1 = 4.5 - 1 = 3.5$

把10张卡片放入纸袋中,任意摸一张,要使摸出3的可能性最大,摸出4的可能性最小,卡片上的数字只能是“2、3或4”,请你填一填

答案： 解析：本题考查了可能性的大小。要使摸出数字“3”的可能性最大，摸出数字“4”的可能性最小，就要使写有数字“3”的卡片最多，数字“4”的卡片最少。
答案：3 3 3 3 3 2 2 4 2 2。