计算
0.3×0.2=
0.5×0.6=
0.04×0.2=
0.25×0.4=
1.25×0.8=
0.05×0.08=
0.7×0.8=
0.1×0.9=
0.15×0.4=
2.5×0.4=
0.06×0.5=
0.08×0.5=
0.9×0.03=
0.4×0.05=
1.2×0.5=
0.12×0.3=
0.07×0.2=
0.36×0.2=
0.8×0.05=
0.2×0.15=
0.09×0.6=
0.5×0.04=
0.2×0.16=
0.25×0.8=
0.03×0.4=
0.6×0.05=
0.125×0.8=

0.3×0.2=0.06
0.5×0.6=0.3
0.04×0.2=0.008
0.25×0.4=0.1
1.25×0.8=1
0.05×0.08=0.004
0.7×0.8=0.56
0.1×0.9=0.09
0.15×0.4=0.06
2.5×0.4=1
0.06×0.5=0.03
0.08×0.5=0.04
0.9×0.03=0.027
0.4×0.05=0.02
1.2×0.5=0.6
0.12×0.3=0.036
0.07×0.2=0.014
0.36×0.2=0.072
0.8×0.05=0.04
0.2×0.15=0.03
0.09×0.6=0.054
0.5×0.04=0.02
0.2×0.16=0.032
0.25×0.8=0.2
0.03×0.4=0.012
0.6×0.05=0.03
0.125×0.8=1

给下面各题的积点上小数点
$\begin{array}{r} 5.8\\ ×\quad 5\\ \hline 290\end{array}$
$\begin{array}{r} 5.8\\ ×\quad 50\\ \hline 2900\end{array}$
$\begin{array}{r} 5.8\\ ×\quad $$\\ \hline 29000\end{array}$
$\begin{array}{r} 5.8\\ ×\quad 5000\\ \hline 290000\end{array}$

$\begin{array}{r} 5.8\\ ×\quad 5\\ \hline 29.0\end{array}$
$\begin{array}{r} 5.8\\ ×\quad 50\\ \hline 290.0\end{array}$
$\begin{array}{r} 5.8\\ ×\quad 500\\ \hline 2900.0\end{array}$
$\begin{array}{r} 5.8\\ ×\quad 5000\\ \hline 29000.0\end{array}$

按要求取下列各数的近似值
保留一位小数 保留两位小数 保留整数
1.414≈ 2.4605≈ 3.524≈
2.039≈ 3.487≈ 0.7601≈
14.281≈ 4.896≈ 2.063≈
3.956≈ 5.8955≈ 9.672≈
0.871≈ 5.8907≈ 14.871≈
79.056≈ 6.7049≈ 8.417≈
89.931≈ 8.0917≈ 9.901≈
99.907≈ 8.0956≈ 1.234≈
4.572≈ 0.9972≈ 9.475≈

保留一位小数
$1.414≈1.4$
$2.039≈2.0$
$14.281≈14.3$
$3.956≈4.0$
$0.871≈0.9$
$79.056≈79.1$
$89.931≈89.9$
$99.907≈99.9$
$4.572≈4.6$
保留两位小数
$2.4605≈2.46$
$3.487≈3.49$
$4.896≈4.90$
$5.8955≈5.90$
$5.8907≈5.89$
$6.7049≈6.70$
$8.0917≈8.09$
$8.0956≈8.10$
$0.9972≈1.00$
保留整数
$3.524≈4$
$0.7601≈1$
$2.063≈2$
$9.672≈10$
$14.871≈15$
$8.417≈8$
$9.901≈10$
$1.234≈1$
$9.475≈9$