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① 直接写出得数。(每题1分,共20分)
1.5÷5=
138.7-69.2=
0.875-0.625=
6.15+3.22=
1.25+3.75=
167+258=
8.2+4.5=
2.4-1.5=
3.14÷3.14=
1.8×20=
3.3-2.2=
4.68+9.22=
685-357=
84+47.9=
0.575-0.375=
1.8÷0.3=
2.18+8.49=
47.5-32.1=
684+549=
0.16÷0.04=
1.5÷5=
138.7-69.2=
0.875-0.625=
6.15+3.22=
1.25+3.75=
167+258=
8.2+4.5=
2.4-1.5=
3.14÷3.14=
1.8×20=
3.3-2.2=
4.68+9.22=
685-357=
84+47.9=
0.575-0.375=
1.8÷0.3=
2.18+8.49=
47.5-32.1=
684+549=
0.16÷0.04=
答案
0.3
69.5
0.25
9.37
5
425
12.7
0.9
1
36
1.1
13.9
328
131.9
0.2
6
10.67
15.4
1233
4
69.5
0.25
9.37
5
425
12.7
0.9
1
36
1.1
13.9
328
131.9
0.2
6
10.67
15.4
1233
4
② 计算。(每题3分,共18分)
$4.62×101+3.38$
$12.5×3.9×0.8$
$6.7×101$
$25×44$
$478-149-51$
$2.2+3.4+7.8+2.6$
$4.62×101+3.38$
$12.5×3.9×0.8$
$6.7×101$
$25×44$
$478-149-51$
$2.2+3.4+7.8+2.6$
答案
470
39
676.7
1100
278
16
39
676.7
1100
278
16
③ 解方程。(每题4分,共12分)
$1.2×6+8x=12$
$7.8x-6.5x=3.9$
$x÷0.6=0.42$
$1.2×6+8x=12$
$7.8x-6.5x=3.9$
$x÷0.6=0.42$
答案
解:$x=0.6$ 解:$x=3$ 解:$x=0.252$
