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1. 直接写出得数。(20☆)
$6.6×5 = $
$0.88÷8.8 = $
$3.6×0.3 = $
$15.3 - 8.7 = $
$2.73÷3 = $
$0.56÷2.8 = $
$0.23×0.3 = $
$8.85 - 3.74 = $
$2.45÷0.7 = $
$5.2×0.4 = $
$6.4÷0.4 = $
$9.6 - 5.21 = $
$0.06÷0.3 = $
$3.92÷0.7 = $
$5.6 + 3.6 = $
$54.6÷0.6 = $
$1.22÷0.2 = $
$4.62÷0.6 = $
$8.6 + 99.3 = $
$5.26÷0.2 = $
$3.9×0.7 = $
$3.68÷0.4 = $
$11.3 + 15.1 = $
$9.9÷0.9 = $
$26.7÷3 = $
$2.76÷0.3 = $
$8.4 + 6.2 = $
$2.7 + 1.4 = $
$31.2÷4 = $
$12÷0.4 = $
$9.35 - 1.81 = $
$250×4 = $
$3a + 2a = $
$8a - 6a + 4a = $
$b×b = $
$2x - 0.2x = $
$9m + 5m = $
$11t - 7t = $
$8x + x = $
$b - 0.24b = $
$6.6×5 = $
33
$0.88÷8.8 = $
0.1
$3.6×0.3 = $
1.08
$15.3 - 8.7 = $
6.6
$2.73÷3 = $
0.91
$0.56÷2.8 = $
0.2
$0.23×0.3 = $
0.069
$8.85 - 3.74 = $
5.11
$2.45÷0.7 = $
3.5
$5.2×0.4 = $
2.08
$6.4÷0.4 = $
16
$9.6 - 5.21 = $
4.39
$0.06÷0.3 = $
0.2
$3.92÷0.7 = $
5.6
$5.6 + 3.6 = $
9.2
$54.6÷0.6 = $
91
$1.22÷0.2 = $
6.1
$4.62÷0.6 = $
7.7
$8.6 + 99.3 = $
107.9
$5.26÷0.2 = $
26.3
$3.9×0.7 = $
2.73
$3.68÷0.4 = $
9.2
$11.3 + 15.1 = $
26.4
$9.9÷0.9 = $
11
$26.7÷3 = $
8.9
$2.76÷0.3 = $
9.2
$8.4 + 6.2 = $
14.6
$2.7 + 1.4 = $
4.1
$31.2÷4 = $
7.8
$12÷0.4 = $
30
$9.35 - 1.81 = $
7.54
$250×4 = $
1000
$3a + 2a = $
5a
$8a - 6a + 4a = $
6a
$b×b = $
$b^{2}$
$2x - 0.2x = $
1.8x
$9m + 5m = $
14m
$11t - 7t = $
4t
$8x + x = $
9x
$b - 0.24b = $
0.76b
答案
33 0.1 1.08 6.6 0.91 0.2 0.069 5.11 3.5 2.08 16 4.39 0.2 5.6 9.2 91 6.1 7.7 107.9 26.3 2.73 9.2 26.4 11 8.9 9.2 14.6 4.1 7.8 30 7.54 1000 5a 6a $b^{2}$ 1.8x 14m 4t 9x 0.76b
2. 不计算,把下列每组方程中代表数值最大的字母圈出来。(12☆)
$ \begin{cases}22.9 + x = 100 \\42.9 + x = 100 \\52.9 + x = 100\end{cases} $
$ \begin{cases}122.9 - x = 100 \\142.9 - x = 100 \\152.9 - x = 100\end{cases} $
$ \begin{cases}x ÷ 22.9 = 100 \\x ÷ 42.9 = 100 \\x ÷ 52.9 = 100\end{cases} $
$ \begin{cases}22.9 + x = 100 \\42.9 + x = 100 \\52.9 + x = 100\end{cases} $
$ \begin{cases}122.9 - x = 100 \\142.9 - x = 100 \\152.9 - x = 100\end{cases} $
$ \begin{cases}x ÷ 22.9 = 100 \\x ÷ 42.9 = 100 \\x ÷ 52.9 = 100\end{cases} $
答案
22.9 + $\textcircled{x}$ = 100 152.9 - $\textcircled{x}$ = 100 $\textcircled{x}$ ÷ 52.9 = 100
3. 解方程。(18☆)
$15.5 - x = 7.2$
解：$x = 15.5 - 7.2$
$x=$
$20.8 - x = 12.3$
解：$x = 20.8 - 12.3$
$x=$
$36.7 - x = 18.4$
解：$x = 36.7 - 18.4$
$x=$
$50.6 - x = 25.1$
解：$x = 50.6 - 25.1$
$x=$
$100.9 - x = 45.5$
解：$x = 100.9 - 45.5$
$x=$
$72.3 - x = 36.7$
解：$x = 72.3 - 36.7$
$x=$
用时：____分钟
共得：____☆/50☆
$15.5 - x = 7.2$
解：$x = 15.5 - 7.2$
$x=$
8.3
$20.8 - x = 12.3$
解：$x = 20.8 - 12.3$
$x=$
8.5
$36.7 - x = 18.4$
解：$x = 36.7 - 18.4$
$x=$
18.3
$50.6 - x = 25.1$
解：$x = 50.6 - 25.1$
$x=$
25.5
$100.9 - x = 45.5$
解：$x = 100.9 - 45.5$
$x=$
55.4
$72.3 - x = 36.7$
解：$x = 72.3 - 36.7$
$x=$
35.6
用时：____分钟
共得：____☆/50☆
答案
x = 8.3 x = 8.5 x = 18.3 x = 25.5 x = 55.4 x = 35.6
