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$\begin{aligned}解:4x+5.6&=10\\4x&=4.4\\x&=1.1\end{aligned}$
$\begin{aligned}解:\frac {11}{7}x&=\frac {11}{5}\\x&=\frac {7}{5}\end{aligned}$
$\begin{aligned}解:0.7x&=102-4\\0.7x&=98\\x&=140\end{aligned}$
$\begin{aligned}解:\frac {5}{7}x-\frac {1}{4}x&=\frac {13}{20}\\\frac {13}{28}x&=\frac {13}{20}\\x&=\frac {7}{5}\end{aligned}$
$\begin{aligned}解:2.5+x&=3.6\\x&=1.1\end{aligned}$
$\begin{aligned}解:x-4.5&=0.5\\x&=5\end{aligned}$
解:x-35%x=260
0.65x=260
x=400
解:4x+13=413
4x=400
x=100
②③④⑥⑦
②③⑥⑦
90a+60b
90a-60b
200
13
11
李老师买的书的总价
应找回的钱数
a
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