题目内容
计算下面各题.(能够简便计算的要求简便计算)
45×19+4680÷12= |
| ||||||||
9.8×[3.45-(3.85-0.47)] | [
|
(1)45×19+4680÷12,
=855+390,
=1245;
(2)
9 |
25 |
6 |
25 |
=
9 |
25 |
1 |
6 |
1 |
6 |
6 |
25 |
=(
9 |
25 |
6 |
25 |
1 |
6 |
=
3 |
5 |
1 |
6 |
=
1 |
10 |
(3)9.8×[3.45-(3.85-0.47)],
=9.8×[3.45-3.38],
=9.8×0.07,
=0.686;
(4)[
1 |
2 |
3 |
4 |
3 |
5 |
7 |
10 |
=[
1 |
2 |
3 |
20 |
7 |
10 |
=
7 |
20 |
7 |
10 |
=
1 |
2 |
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计算下面各题.(能够简便计算的要求简便计算)
45×19+4680÷12= | |
9.8×[3.45-(3.85-0.47)] | []. |