【答案】:
解:$? 9x=\frac {27}{40}?$
$? x=\frac {27}{40}÷9?$
$? x=\frac 3{40}?$
解:$? \frac {14}9x=\frac 5{18}+\frac {13}{18}?$
$? x=1÷\frac {14}9?$
$? x=\frac 9{14}?$
解:$? \frac 7{10}x=\frac 35?$
$? x=\frac 35÷\frac 7{10}?$
$? x=\frac 67?$
解:$? \frac 23x=1×6?$
$? x=6÷\frac 23?$
? x=9?
【解析】:
解:$4x+5x=\frac{27}{40}$
$9x=\frac{27}{40}$
$x=\frac{27}{40}÷9$
$x=\frac{3}{40}$
解:$(1+\frac{5}{9})x-\frac{13}{18}=\frac{5}{18}$
$\frac{14}{9}x=\frac{5}{18}+\frac{13}{18}$
$\frac{14}{9}x=1$
$x=1÷\frac{14}{9}$
$x=\frac{9}{14}$
解:$(\frac{3}{5}+\frac{1}{10})x=\frac{3}{5}$
$\frac{7}{10}x=\frac{3}{5}$
$x=\frac{3}{5}÷\frac{7}{10}$
$x=\frac{6}{7}$
解:$\frac{2}{3}x÷6=1$
$\frac{2}{3}x=1×6$
$\frac{2}{3}x=6$
$x=6÷\frac{2}{3}$
$x=9$