题目内容

脱式计算(③④⑤小题用简便方法).
①635+9030÷86×13
②4.1-2.56÷(0.18+0.62)③45×101
④5.7-(1.9-1.3)
98
99
+
98
99
×98
4
5
÷〔
5
8
×(
1
6
+
1
3
)〕
①635+9030÷86×13,
=635+105×13,
=635+1365,
=2000;

②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;

③45×101,
=45×(100+1),
=4500+45,
=4545;

④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;

98
99
+
98
99
×98,
=
98
99
×(1+98),
=
98
99
×99,
=98;

4
5
÷〔
5
8
×(
1
6
+
1
3
)〕,
=
4
5
÷[
5
8
×(
1
6
+
2
6
)],
=
4
5
÷[
5
8
×
1
2
],
=
4
5
÷
5
16

=
4
5
×
16
5

=
64
25

=2
14
25
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