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第62页

信息发布者：

1600

3.7

0.4

$6\frac 27$

$\frac {3}{4}$

$=\frac {1}{8}+\frac {1}{8}$

$=\frac {1}{4}$

=3.7×(99+1)

=3.7×100

=370

$=\frac {8}{3}-(\frac {7}{9}+\frac {2}{9})$

$=\frac {8}{3}-1$

$=\frac {5}{3}$

=25×25

=625

=2.1×1.5÷6.3

=3.15÷6.3

=0.5

$=\frac {9}{20}÷(\frac {1}{2}×\frac {6}{5})$

$=\frac {9}{20}÷\frac {3}{5}$

$=\frac {3}{4}$

$\begin {aligned}解：8.3x&=16.6\\x &=2\end {aligned}$

$\begin {aligned}解：\frac {1}{2}x&=\frac {1}{4}×\frac {1}{6}\\\frac {1}{2}x&=\frac {1}{24}\\x &=\frac {1}{12}\end {aligned}$

989000000

9.89亿

1:4=3:12

0.75