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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