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一、直接写出得数。（共 28 分）
$\frac{1}{2}×\frac{8}{11}=$ $10.2 + 5 =$ $23\% + 57\% =$ $2.5×18×2 =$
$\frac{1}{25}+\frac{1}{50}=$ $80×55\% =$ $20×45\% =$ $38\% ÷38\% - 65\% =$
$3.35 - 0.4 =$ $0.63÷0.09 =$ $28\% ÷70\% =$ $(0.9 - 0.45)×2 =$
$7\% ÷35 =$ $32×\frac{3}{20}=$ $0.63÷0.9 =$ $7.2÷(1 - 80\%) =$
$\frac{3}{4}÷75\% =$ $\frac{5}{9}÷\frac{3}{5}=$ $12.5\% ×80\% =$ $(0.35 + 1.25)×0.06 =$
$1.02×30 =$ $2.9 - 2.09 =$ $0.57÷30\% =$ $\frac{5}{6}×\frac{1}{3}÷\frac{3}{4}=$
$3÷5\% =$ $\frac{3}{8}+37.5\% =$ $3.14×0.4 =$ $\frac{3}{11}×77\% + 23\% =$
$\frac{1}{2}×\frac{8}{11}=$ $10.2 + 5 =$ $23\% + 57\% =$ $2.5×18×2 =$
$\frac{1}{25}+\frac{1}{50}=$ $80×55\% =$ $20×45\% =$ $38\% ÷38\% - 65\% =$
$3.35 - 0.4 =$ $0.63÷0.09 =$ $28\% ÷70\% =$ $(0.9 - 0.45)×2 =$
$7\% ÷35 =$ $32×\frac{3}{20}=$ $0.63÷0.9 =$ $7.2÷(1 - 80\%) =$
$\frac{3}{4}÷75\% =$ $\frac{5}{9}÷\frac{3}{5}=$ $12.5\% ×80\% =$ $(0.35 + 1.25)×0.06 =$
$1.02×30 =$ $2.9 - 2.09 =$ $0.57÷30\% =$ $\frac{5}{6}×\frac{1}{3}÷\frac{3}{4}=$
$3÷5\% =$ $\frac{3}{8}+37.5\% =$ $3.14×0.4 =$ $\frac{3}{11}×77\% + 23\% =$
答案
一 $\frac{4}{11}$ 15.2 0.8 90
$\frac{3}{50}$ 44 9 0.35
2.95 7 0.4 0.9
0.002 $\frac{24}{5}$ 0.7 36
1 $\frac{25}{27}$ 0.1 0.096
30.6 0.81 1.9 $\frac{10}{27}$
60 $\frac{3}{4}$ 1.256 0.44
$\frac{3}{50}$ 44 9 0.35
2.95 7 0.4 0.9
0.002 $\frac{24}{5}$ 0.7 36
1 $\frac{25}{27}$ 0.1 0.096
30.6 0.81 1.9 $\frac{10}{27}$
60 $\frac{3}{4}$ 1.256 0.44
二、计算下面各题，能简算的要简算。（共 30 分）
$29.6 - (9.6 + 4.5)$ $71\% ×3.42 + 29\% ×3.42$
$\frac{2}{5}×[64\% + (36\% - \frac{7}{24})]$ $7.8÷[32×(1 - \frac{5}{8})+3.6]$
$975×0.25 + 9\frac{3}{4}×76 - 9.75$ $3.5×1\frac{1}{4}+125\% + 1\frac{1}{2}÷\frac{4}{5}$
$29.6 - (9.6 + 4.5)$ $71\% ×3.42 + 29\% ×3.42$
$\frac{2}{5}×[64\% + (36\% - \frac{7}{24})]$ $7.8÷[32×(1 - \frac{5}{8})+3.6]$
$975×0.25 + 9\frac{3}{4}×76 - 9.75$ $3.5×1\frac{1}{4}+125\% + 1\frac{1}{2}÷\frac{4}{5}$
答案
1. 计算$29.6-(9.6 + 4.5)$
解：
$\begin{aligned}&29.6-(9.6 + 4.5)\\=&29.6 - 9.6-4.5\\=&20-4.5\\=&15.5\end{aligned}$
2. 计算$71\%×3.42 + 29\%×3.42$
解：
$\begin{aligned}&71\%×3.42 + 29\%×3.42\\=&3.42×(71\% + 29\%)\\=&3.42×1\\=&3.42\end{aligned}$
3. 计算$\frac{2}{5}×[64\%+(36\%-\frac{7}{24})]$
解：
$\begin{aligned}&\frac{2}{5}×[64\%+(36\%-\frac{7}{24})]\\=&\frac{2}{5}×[(64\% + 36\%)-\frac{7}{24}]\\=&\frac{2}{5}×(1-\frac{7}{24})\\=&\frac{2}{5}×\frac{17}{24}\\=&\frac{17}{60}\end{aligned}$
4. 计算$7.8÷[32×(1 - \frac{5}{8})+3.6]$
解：
$\begin{aligned}&7.8÷[32×(1 - \frac{5}{8})+3.6]\\=&7.8÷(32×\frac{3}{8}+3.6)\\=&7.8÷(12 + 3.6)\\=&7.8÷15.6\\=&0.5\end{aligned}$
5. 计算$975×0.25 + 9\frac{3}{4}×76 - 9.75$
解：
$\begin{aligned}&975×0.25 + 9\frac{3}{4}×76 - 9.75\\=&9.75×25+9.75×76 - 9.75\\=&9.75×(25 + 76-1)\\=&9.75×100\\=&975\end{aligned}$
6. 计算$3.5×1\frac{1}{4}+125\%+1\frac{1}{2}÷\frac{4}{5}$
解：
$\begin{aligned}&3.5×1\frac{1}{4}+125\%+1\frac{1}{2}÷\frac{4}{5}\\=&3.5×\frac{5}{4}+\frac{5}{4}+1.5×\frac{5}{4}\\=&\frac{5}{4}×(3.5 + 1+1.5)\\=&\frac{5}{4}×6\\=&7.5\end{aligned}$
综上，答案依次为$15.5$；$3.42$；$\frac{17}{60}$；$0.5$；$975$；$7.5$。
解：
$\begin{aligned}&29.6-(9.6 + 4.5)\\=&29.6 - 9.6-4.5\\=&20-4.5\\=&15.5\end{aligned}$
2. 计算$71\%×3.42 + 29\%×3.42$
解：
$\begin{aligned}&71\%×3.42 + 29\%×3.42\\=&3.42×(71\% + 29\%)\\=&3.42×1\\=&3.42\end{aligned}$
3. 计算$\frac{2}{5}×[64\%+(36\%-\frac{7}{24})]$
解：
$\begin{aligned}&\frac{2}{5}×[64\%+(36\%-\frac{7}{24})]\\=&\frac{2}{5}×[(64\% + 36\%)-\frac{7}{24}]\\=&\frac{2}{5}×(1-\frac{7}{24})\\=&\frac{2}{5}×\frac{17}{24}\\=&\frac{17}{60}\end{aligned}$
4. 计算$7.8÷[32×(1 - \frac{5}{8})+3.6]$
解：
$\begin{aligned}&7.8÷[32×(1 - \frac{5}{8})+3.6]\\=&7.8÷(32×\frac{3}{8}+3.6)\\=&7.8÷(12 + 3.6)\\=&7.8÷15.6\\=&0.5\end{aligned}$
5. 计算$975×0.25 + 9\frac{3}{4}×76 - 9.75$
解：
$\begin{aligned}&975×0.25 + 9\frac{3}{4}×76 - 9.75\\=&9.75×25+9.75×76 - 9.75\\=&9.75×(25 + 76-1)\\=&9.75×100\\=&975\end{aligned}$
6. 计算$3.5×1\frac{1}{4}+125\%+1\frac{1}{2}÷\frac{4}{5}$
解：
$\begin{aligned}&3.5×1\frac{1}{4}+125\%+1\frac{1}{2}÷\frac{4}{5}\\=&3.5×\frac{5}{4}+\frac{5}{4}+1.5×\frac{5}{4}\\=&\frac{5}{4}×(3.5 + 1+1.5)\\=&\frac{5}{4}×6\\=&7.5\end{aligned}$
综上，答案依次为$15.5$；$3.42$；$\frac{17}{60}$；$0.5$；$975$；$7.5$。
