问题 解答题
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
答案

(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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