题目内容

计算下面各题.(能够简便计算的要求简便计算)
45×19+4680÷12=
9
25
÷6+1÷6×
6
25
9.8×[3.45-(3.85-0.47)] [
1
2
-(
3
4
-
3
5
)
]÷
7
10

(1)45×19+4680÷12,
=855+390,
=1245;

(2)
9
25
÷6+1÷6×
6
25

=
9
25
×
1
6
+
1
6
×
6
25

=(
9
25
+
6
25
)×
1
6

=
3
5
×
1
6

=
1
10


(3)9.8×[3.45-(3.85-0.47)],
=9.8×[3.45-3.38],
=9.8×0.07,
=0.686;

(4)[
1
2
-(
3
4
-
3
5
)
]÷
7
10

=[
1
2
-
3
20
]÷
7
10

=
7
20
÷
7
10

=
1
2
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