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①直接写出得数。(每题1分,共20分)
7.9+0.1=
13.8-4=
14-8.5=
5.2÷0.52=
9.6-8.3=
654+745=
8.01-2.46=
22.5+19=
12+8.6=
2.4×0.01=
12.5+9=
0.27÷0.03=
64.2+38.9=
5.8+0.2=
324-187=
0.25÷0.05=
5.75+4.39=
472-198=
5.6-4.4=
2.4×5=
7.9+0.1=
13.8-4=
14-8.5=
5.2÷0.52=
9.6-8.3=
654+745=
8.01-2.46=
22.5+19=
12+8.6=
2.4×0.01=
12.5+9=
0.27÷0.03=
64.2+38.9=
5.8+0.2=
324-187=
0.25÷0.05=
5.75+4.39=
472-198=
5.6-4.4=
2.4×5=
答案
10
9.8
5.5
10
1.3
1399
5.55
41.5
20.6
0.024
21.5
9
103.1
6
137
5
10.14
274
1.2
12
9.8
5.5
10
1.3
1399
5.55
41.5
20.6
0.024
21.5
9
103.1
6
137
5
10.14
274
1.2
12
② 计算。(每题3分,共18分)
$4.7×24÷12$
$4.3×9.9$
$4.6×3.7+6.3×4.6$
$25×3.48×0.4$
$101×0.45$
$3.14×1.9+31.4×0.81$
$4.7×24÷12$
$4.3×9.9$
$4.6×3.7+6.3×4.6$
$25×3.48×0.4$
$101×0.45$
$3.14×1.9+31.4×0.81$
答案
9.4
42.57
46
34.8
45.45
31.4
42.57
46
34.8
45.45
31.4
③ 解方程。(每题4分,共12分)
$12x + x = 26$
$3x - 57 = 24.3$
$12×6 + 8x = 120$
$12x + x = 26$
$3x - 57 = 24.3$
$12×6 + 8x = 120$
答案
解:$x=2$ 解:$x=27.1$ 解:$x=6$
