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计算下面各题(能简算的要简算).①4×0.8×2.5×12.5②215÷[1-(15+13)]③(2.8+3.85÷3.5)×4.6④6.5×1.83+0.17×6.5⑤(58+227)×8+1127⑥920÷[32×(0.4+45)].
题目详情
计算下面各题(能简算的要简算). ①4×0.8×2.5×12.5 | ②
| ③(2.8+3.85÷3.5)×4.6 | ||||||||||||
④6.5×1.83+0.17×6.5 | ⑤(
| ⑥
|
▼优质解答
答案和解析
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
②
÷[1-(
+
)],
=
÷[1-
],
=
÷
,
=
;
③(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94;
④6.5×1.83+0.17×6.5,
=6.5×(1.83+0.17),
=6.5×2,
=13;
⑤(
+
)×8+
,
=
×8+
×8+
,
=5+
+
,
=2+(
+
),
=2+1,
=3;
⑥
÷[
×(0.4+
)],
=
÷[
×
],
=
÷
,
=
.
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
②
2 |
15 |
1 |
5 |
1 |
3 |
=
2 |
15 |
8 |
15 |
=
2 |
15 |
7 |
15 |
=
2 |
7 |
③(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94;
④6.5×1.83+0.17×6.5,
=6.5×(1.83+0.17),
=6.5×2,
=13;
⑤(
5 |
8 |
2 |
27 |
11 |
27 |
=
5 |
8 |
2 |
27 |
11 |
27 |
=5+
16 |
27 |
11 |
27 |
=2+(
16 |
27 |
11 |
27 |
=2+1,
=3;
⑥
9 |
20 |
3 |
2 |
4 |
5 |
=
9 |
20 |
3 |
2 |
6 |
5 |
=
9 |
20 |
9 |
5 |
=
1 |
4 |
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