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第61頁(yè)

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2320
6.37
52
40
1.6
?$2\frac {1}{12}$?
?$\frac {16}{7}$?
1
?$\frac {4}{9}$?
=900-212
=688
=2.5×0.4×1.8
=1×1.8
=1.8
?$ =\frac {3}{5}×\frac {7}{9}×\frac {3}{2}+\frac {2}{3}×\frac {3}{2}×\frac {3}{5}$?
?$=\frac {7}{15}×\frac {3}{2}+1×\frac {3}{5}$?
?$=\frac {7}{10}+\frac {3}{5}$?
?$=\frac {13}{10}$?
=(3.5+5.5+1)×0.8
=10×0.8
=8
?$ =(4.56+3.44)-(\frac 47+\frac 37)$?
?$=8-1$?
?$=7$?
=9.24÷[1.5×0.2]
=9.24÷0.3
=30.8
$\begin {aligned}解： 0.68x&=1.7\\x &=2.5\end {aligned}$
$\begin {aligned}解： \frac {2}{9}x&=10×\frac {4}{5}\\\frac {2}{9}x&=8\\x &=36\end {aligned}$
$\begin {aligned}解： 3+5x&=100\\5x&=97\\x &=19.4\end {aligned}$
4360
3.1
18
16
75
0.75
80
?$\frac {5}{4}$?
80050
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