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① 直接写出得数。(每题1分,共20分)
8.8+1.2=
39.5-16.8=
0.32÷0.8=
4.2÷0.2=
98.7-73.8=
92+18.7=
65.2-12.6=
95+118=
9.7-8.5=
45×0.4=
128.9-47.6=
67.3-22.4=
20-15.5=
9.84-4.92=
0.42÷0.7=
4.2÷2.1=
0.37×0.4=
9.85-4.57=
18+37.5=
3.92+7.2=
8.8+1.2=
39.5-16.8=
0.32÷0.8=
4.2÷0.2=
98.7-73.8=
92+18.7=
65.2-12.6=
95+118=
9.7-8.5=
45×0.4=
128.9-47.6=
67.3-22.4=
20-15.5=
9.84-4.92=
0.42÷0.7=
4.2÷2.1=
0.37×0.4=
9.85-4.57=
18+37.5=
3.92+7.2=
答案
1. 10
22.7
0.4
21
24.9
110.7
52.6
213
1.2
18
81.3
44.9
4.5
4.92
0.6
2
0.148
5.28
55.5
11.12
22.7
0.4
21
24.9
110.7
52.6
213
1.2
18
81.3
44.9
4.5
4.92
0.6
2
0.148
5.28
55.5
11.12
② 计算。(每题3分,共18分)
$0.125×3.2×0.25$
$0.125×8.54×80$
$5.4×2.08+66×0.208-2.08$
$1.25×0.7×0.8$
$23.4-0.8-13.4-7.2$
$9.07-22.78÷3.4$
$0.125×3.2×0.25$
$0.125×8.54×80$
$5.4×2.08+66×0.208-2.08$
$1.25×0.7×0.8$
$23.4-0.8-13.4-7.2$
$9.07-22.78÷3.4$
答案
0.1
85.4
22.88
0.7
2
2.37
85.4
22.88
0.7
2
2.37
③ 解方程。(每题4分,共12分)
$2x - 9.1 = 4.7$
$1.5 + 5x = 31.5$
$5.8 × 4.5 + 0.4x = 29.1$
$2x - 9.1 = 4.7$
$1.5 + 5x = 31.5$
$5.8 × 4.5 + 0.4x = 29.1$
答案
解:x=6.9
解:x=6
解:x=7.5
解:x=6
解:x=7.5
