题目内容

计算下面各题,能简算的简算.
①
5
12
÷
15
21
+
1
4
×
3
5

②58×102
③
9
18
×[
3
16
-(
7
16
-
1
4
)]
④0.888×125×73+999×73.
①
5
12
÷
15
21
+
1
4
×
3
5
,
=
5
12
×
21
15
+
1
4
×
3
5
,
=
7
12
+
3
20
,
=
11
15
;

②58×102,
=58×(100+2),
=58×100+58×2,
=5800+116,
=5916;

③
9
18
×[
3
16
-(
7
16
-
1
4
)],
=
9
18
×[
3
16
-
3
16
],
=
9
18
×0.
=0;

④0.888×125×73+999×73,
=[(0.8+0.08+0.008)×125]×73+999×73,
=[0.8×125+0.08×125+0.008×125]×73+999×73,
=[100+10+1]×73+999×73,
=111×73+999×73,
=(111+999)×73,
=1110×73,
=81030.
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