《2025年一本暑假计算加应用题五年级数学北师大版》

1. 单位换算。(每空1★)
$1.8dm= (18)cm$ $5.8cm= (0.58)dm$ $3.6cm= (36)mm$
$56mm= (5.6)cm$ $72cm= (7.2)dm$ $240mm= (24)cm$
$0.3m^{2}= (3000)cm^{2}$ $2.9dm^{2}= (290)cm^{2}$ $3.4m^{2}= (340)dm^{2}$
$0.6m^{2}= (6000)cm^{2}$ $48cm^{2}= (0.48)dm^{2}$ $45cm^{2}= (0.45)dm^{2}$
$240dm^{3}= (0.24)m^{3}$ $4.2m^{3}= (4200)dm^{3}$ $0.27dm^{3}= (270)cm^{3}$
$6800mL= (6.8)L$ $3.45m^{2}= (345)dm^{2}$ $3600cm^{3}= (3.6)dm^{3}$
$5420cm^{3}= (5.42)dm^{3}= (5.42)L$ $2.6L= (2.6)dm^{3}= (2600)cm^{3}$

答案： 18 0.58 36
5.6 7.2 24
3000 290 340
6000 0.48 0.45
0.24 4200 270
6.8 345 3.6
5.42 5.42 2.6 2600

2. 计算下面各题,能简算的要简算。(每题3★)
$\frac {29}{24}+\frac {4}{9}-\frac {5}{24}$ $\frac {1}{12}+\frac {1}{4}+\frac {5}{12}+\frac {3}{4}$ $10-\frac {4}{15}-\frac {1}{5}-\frac {8}{15}$
$\frac {11}{15}-(\frac {1}{3}+\frac {1}{5})$ $\frac {6}{7}-\frac {5}{14}+\frac {1}{3}$ $3.84+\frac {20}{17}+6.16-\frac {3}{17}$

答案： 1 $\frac{4}{9}$ 1 $\frac{1}{2}$ 9
$\frac{1}{5}$ $\frac{5}{6}$ 11

3. 解方程。(每题3★)
$\frac {5}{8}+x= \frac {2}{3}$，$x=$$\frac{1}{24}$ $\frac {8}{9}-x= \frac {1}{6}$，$x=$$\frac{13}{18}$ $x-\frac {3}{10}= 0.25$，$x=$$\frac{11}{20}$

答案： $x=\frac{1}{24}$ $x=\frac{13}{18}$ $x=\frac{11}{20}$