题目内容

脱式计算.
1
4
×
3
7
+
4
7
÷4
②3.8×999+3.8③(
1
2
+
1
8
-
1
6
)÷
1
48
④444-47+546-53⑤5000-27÷18×106
1
2×3
+
1
3×4
+…+
1
98×99
+
1
99×100
1
4
×
3
7
+
4
7
÷
4,
=
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
)×48,
=
1
2
×48+
1
8
×
48-
1
6
×48,
=24+6-8,
=22;
④444-47+546-53,
=(444+546)-(47+53),
=990-100,
=890;
⑤5000-27÷18×106,
=5000-
27
18
×
106,
=5000-159,
=4841;
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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