题目内容
脱式计算. ①
| ②3.8×999+3.8 | ③(
| ||||||||||||||
④444-47+546-53 | ⑤5000-27÷18×106 | ⑥
|
①
×
+
÷4,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
②3.8×999+3.8,
=(999+1)×3.8,
=1000×3.8,
=3800;
③(
+
-
)÷
,
=(
+
-
)×48,
=
×48+
×48-
×48,
=24+6-8,
=22;
④444-47+546-53,
=(444+546)-(47+53),
=990-100,
=890;
⑤5000-27÷18×106,
=5000-
×106,
=5000-159,
=4841;
⑥
+
+…+
+
,
=(
-
)+(
-
)+…+(
-
)+(
-
),
=
-
,
=
-
,
=
.
1 |
4 |
3 |
7 |
4 |
7 |
=
1 |
4 |
3 |
7 |
4 |
7 |
1 |
4 |
=(
3 |
7 |
4 |
7 |
1 |
4 |
=1×
1 |
4 |
=
1 |
4 |
②3.8×999+3.8,
=(999+1)×3.8,
=1000×3.8,
=3800;
③(
1 |
2 |
1 |
8 |
1 |
6 |
1 |
48 |
=(
1 |
2 |
1 |
8 |
1 |
6 |
=
1 |
2 |
1 |
8 |
1 |
6 |
=24+6-8,
=22;
④444-47+546-53,
=(444+546)-(47+53),
=990-100,
=890;
⑤5000-27÷18×106,
=5000-
27 |
18 |
=5000-159,
=4841;
⑥
1 |
2×3 |
1 |
3×4 |
1 |
98×99 |
1 |
99×100 |
=(
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
98 |
1 |
99 |
1 |
99 |
1 |
100 |
=
1 |
2 |
1 |
100 |
=
50 |
100 |
1 |
100 |
=
49 |
100 |
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