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電子課本網(wǎng) › 第22頁

第22頁

信息發(fā)布者：
1024
0.09
?$2\frac{1}{2}$?
15.8
4
??$\frac {24}{7}$??
56
?$1\frac{1}{4}$?
=12.5×8×4×2.5
=100×10
=1000
=2.3+3.91÷2.3
=2.3+1.7
=4
=720÷(15×6)
=720÷90
=8
??$=\frac {2}{5}÷\frac {1}{2}$??
??$=\frac {4}{5}$??
??$=\frac {3}{4}×(\frac {2}{5}+\frac {3}{5})$??
??$=\frac {3}{4}×1$??
??$=\frac {3}{4}$??
=1.7×101-1.7
=171.7-1.7
=170
?$\begin{aligned}解：0.25x&=0.8\\x&=3.2\end{aligned}$?
?$\begin{aligned}解：25x&=0.75×8\\25x&=6\\x&=0.24\end{aligned}$?
?$\begin{aligned}解：\frac {1}{5}x&=10\\x&=50\end{aligned}$?
$ \begin{aligned}?解：0.21x&=2.8×0.6 \\ 0.21x&=1.68 \\ x&=8 \\ \end{aligned}$
362000000
36200
4
60
5800
2
40
2
40
25
20
1
4
1
50
2
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