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第123頁

信息發(fā)布者：
B
A
1724
0.37
800
68
$\frac{1}{3}$
$\frac{27}{25}$
?$1\frac 35$?
?$ \frac {13}{15}$?
514.8
?$\begin {aligned}&756\div (2×158 - 309)\\=&756\div (316 - 309)\\=&756\div 7\\=&108\end {aligned}$?
?$\begin {aligned}&\frac {7}{24}\div (\frac {5}{6}-\frac {3}{4})×\frac {3}{14}\\=&\frac {7}{24}\div \frac {1}{12}×\frac {3}{14}\\=&\frac {7}{2}×\frac {3}{14}\\=&\frac {3}{4}\end {aligned}$?
?$ \begin {aligned}&18.5-(5.5 + 4.9)\div 1.3\\=&18.5 - 10.4\div 1.3\\=&18.5 - 8\\=&10.5\end {aligned}$?
解：
?$ \begin {aligned}x - 35\%x&=0.52\\0.65x&=0.52\\x &=0.52\div 0.65\\x &=0.8\end {aligned}$?
解：
?$\begin {aligned}\frac {1}{9}：\frac {1}{18}&=9：x\\\frac {1}{9}x&=\frac {1}{18}×9\\\frac {1}{9}x&=\frac {1}{2}\\x &=\frac {1}{2}\div \frac {1}{9}\\x &=4.5\end {aligned}$?

1：4
?$ $?選條件?$ (2)$?
?$36\div 80\%×(1 - 80\%) = 9($?人?$)$?
答：錯(cuò)誤的有?$9$?人。
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