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 解：$x + 45\%x = 14.5$

 $1.45x = 14.5$

 $x = 14.5\div1.45$

 $x = 10$

 解：$1 + 45\%x = 14.5$

 $0.45x = 14.5 - 1$

 $0.45x = 13.5$

 $x = 13.5\div0.45$

 $x = 30$

 解：$2x - 96\%x = 0.26$

 $2x - 0.96x = 0.26$

 $1.04x = 0.26$

 $x = 0.26\div1.04$

 $x = 0.25$

 解：$3x + 90\%\times4 = 9$

 $3x + 0.9\times4 = 9$

 $3x + 3.6 = 9$

 $3x = 9 - 3.6$

 $3x = 5.4$

 $x = 5.4\div3$

 $x = 1.8$

$=7×\frac{9}{7}+\frac{7}{9}×\frac{1}{7}
=9+\frac{1}{9}
=9\frac{1}{9}$

$=24÷0.4÷\frac{5}{8}
=60×\frac{8}{5}
=96 $

$=\frac{2}{7}×\frac{1}{5}+\frac{5}{7}×\frac{1}{5}$

$=(\frac{2}{7}+\frac{5}{7})×\frac{1}{5}$

$=1×\frac{1}{5}$

$=\frac{1}{5}$

$=\frac{8}{9}÷[(\frac{3}{6}+\frac{1}{6})×\frac{4}{3}]
=\frac{8}{9}÷[\frac{4}{6}×\frac{4}{3}]
=\frac{8}{9}÷[\frac{2}{3}×\frac{4}{3}]
=\frac{8}{9}÷\frac{8}{9}
=1 $

$=\frac{8}{17}×\frac{1}{23}+\frac{1}{23}×\frac{9}{17} $

$=1×\frac{1}{23}$

$=\frac{1}{23}$

$=\frac{3}{4}÷[56×\frac{3}{7}-56×\frac{3}{8}]$

$=\frac{3}{4}÷[24 - 21]$

$=\frac{3}{4}÷3$

$=\frac{3}{4}×\frac{1}{3}$

$=\frac{1}{4}$

$=\frac{5}{8}×8+\frac{1}{27}×8+\frac{19}{27}
=5+\frac{8}{27}+\frac{19}{27}
=5 + 1
=6 $

$=35×\frac{8}{7}-\frac{2}{7}$

$=40 - \frac{2}{7}$

$=39\frac{5}{7}$

【答案】：
解：1.45x=14.5
x=14.5÷1.45
x=10
解：0.45x=14.5-1
x=13.5÷0.45
x=30
解：1.04x=0.26
x=0.26÷1.04
x=0.25
解：3x=9-3.6
x=5.4÷3
x=1.8

【解析】：
解：$x + 45\%x = 14.5$
$1.45x = 14.5$
$x = 10$
解：$1 + 45\%x = 14.5$
$0.45x = 13.5$
$x = 30$
解：$2x - 96\%x = 0.26$
$1.04x = 0.26$
$x = 0.25$
解：$3x + 90\%×4 = 9$
$3x + 3.6 = 9$
$3x = 5.4$
$x = 1.8$

【答案】：
$? =7×\frac 97+\frac 79×\frac 17?$
$? =9+\frac 19?$
$? =9\frac 19?$
$? =24÷0.4×\frac 85?$
$? =60×\frac 85?$
? =96?
$? =\frac 27×\frac 15+\frac 57×\frac 15?$
$? =(\frac 27+\frac 57)×\frac 15?$
$? =\frac 15?$
$? =\frac 89÷[\frac 23×\frac 43]?$
$? =\frac 89÷\frac 89?$
? =1?
$? =\frac 8{17}×\frac 1{23}+\frac 1{23}×\frac 9{17}?$
$? =(\frac 8{17}+\frac 9{17})×\frac 1{23}?$
$? =\frac 1{23}?$
$? =\frac 34÷[56×\frac 37-56×\frac 38]?$
$? =\frac 34÷[24-21]?$
$? =\frac 34÷3?$
$? =\frac 14?$
$? =\frac 58×8+8×\frac 1{27}+\frac {19}{27}?$
$? =5+\frac 8{27}+\frac {19}{27}?$
? =6?
$? =35×\frac 87×1-\frac 27?$
$? =40-\frac 27?$
$? =39\frac 57?$

【解析】：
$7÷\frac{7}{9}+\frac{7}{9}÷7$
$=7×\frac{9}{7}+\frac{7}{9}×\frac{1}{7}$
$=9+\frac{1}{9}$
$=9\frac{1}{9}$
$24÷(1 - 60\%)÷\frac{5}{8}$
$=24÷0.4÷\frac{5}{8}$
$=60×\frac{8}{5}$
$=96$
$\frac{2}{7}×20\%+\frac{5}{7}×\frac{1}{5}$
$=\frac{2}{7}×\frac{1}{5}+\frac{5}{7}×\frac{1}{5}$
$=(\frac{2}{7}+\frac{5}{7})×\frac{1}{5}$
$=1×\frac{1}{5}$
$=\frac{1}{5}$
$\frac{8}{9}÷[(\frac{1}{2}+\frac{1}{6})÷\frac{3}{4}]$
$=\frac{8}{9}÷[(\frac{3}{6}+\frac{1}{6})×\frac{4}{3}]$
$=\frac{8}{9}÷[\frac{4}{6}×\frac{4}{3}]$
$=\frac{8}{9}÷[\frac{2}{3}×\frac{4}{3}]$
$=\frac{8}{9}÷\frac{8}{9}$
$=1$
$\frac{8}{17}÷23+\frac{1}{23}×\frac{9}{17}$
$=\frac{8}{17}×\frac{1}{23}+\frac{1}{23}×\frac{9}{17}$
$=(\frac{8}{17}+\frac{9}{17})×\frac{1}{23}$
$=1×\frac{1}{23}$
$=\frac{1}{23}$
$\frac{3}{4}÷[56×(\frac{3}{7}-\frac{3}{8})]$
$=\frac{3}{4}÷[56×\frac{3}{7}-56×\frac{3}{8}]$
$=\frac{3}{4}÷[24 - 21]$
$=\frac{3}{4}÷3$
$=\frac{3}{4}×\frac{1}{3}$
$=\frac{1}{4}$
$(\frac{5}{8}+\frac{1}{27})×8+\frac{19}{27}$
$=\frac{5}{8}×8+\frac{1}{27}×8+\frac{19}{27}$
$=5+\frac{8}{27}+\frac{19}{27}$
$=5 + 1$
$=6$
$35÷\frac{7}{8}×1-\frac{2}{7}$
$=35×\frac{8}{7}-\frac{2}{7}$
$=40 - \frac{2}{7}$
$=39\frac{5}{7}$

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