第120页 - 亮点给力提优课时作业本五年级数学江苏版

B

A

C

B

C

B

$\frac{5}{8}$

$\frac{1}{3}$

$\frac{11}{10}$

$\frac{5}{12}$

$\frac{11} {28}$

$\frac{1}{72}$

$ \begin{aligned}解：x&=\frac {3}{5}-\frac {3}{20} \\ x&=\frac {9}{20} \\ \end{aligned}$

$ \begin{aligned}解：62x&=310 \\ 62x÷62&=310÷62 \\ x&=5 \\ \end{aligned}$

$ \begin{aligned}解：x+\frac {5}{12}&=1 \\ x&=\frac {7}{12} \\ \end{aligned}$

$ \begin{aligned}解：0.5x+3&=3.6 \\ 0.5x&=0.6 \\ x&=1.2 \\ \end{aligned}$

$=(\frac {9}{8}-\frac {1}{8})+(\frac {7}{25}+\frac {13}{25})$

$=1+\frac {4}{5}$

$=1\frac {4}{5}$

$=\frac {16}{9}-\frac {7}{9}-\frac {3}{5}-\frac {2}{5}$

$=(\frac {16}{9}-\frac {7}{9})-(\frac {3}{5}+\frac {2}{5})$

$=1-1$

$=0$