题目内容

计算下面各题,能简便的要写出简算过程.
①
6
13
÷
9
26
×
2
3

②
5
7
×
2
3
+
2
7
÷
3
2

③(
1
15
+
3
49
)×15-
45
49

④[1-(
3
8
+
1
4
)]÷
1
4

⑤(
5
11
+
9
17
)×11×17
⑥
7
8
÷4-0.25×
5
8
.
①
6
13
÷
9
26
×
2
3
,
=
4
3
×
2
3
,
=
8
9
;

②
5
7
×
2
3
+
2
7
÷
3
2
,
=
5
7
×
2
3
+
2
7
×
2
3
,
=(
5
7
+
2
7
)×
2
3
,
=1×
2
3
,
=
2
3
;

③(
1
15
+
3
49
)×15-
45
49
,
=
1
15
×15+
3
49
×15-
45
49
,
=1+
45
49
-
45
49
,
=1-(
45
49
-
45
49
),
=1-0,
=1;

④[1-(
3
8
+
1
4
)]÷
1
4
,
=[1-
5
8
]÷
1
4
,
=
3
8
÷
1
4
,
=
3
2
;

⑤(
5
11
+
9
17
)×11×17,
=(
5
11
+
9
17
)×(11×17),
=
5
11
×(11×17)+
9
17
×(11×17),
=5×17+9×11,
=85+99,
=184;


⑥
7
8
÷4-0.25×
5
8
,
=
7
8
×
1
4
-
1
4
×
5
8
,
=
1
4
×(
7
8
-
5
8
),
=
1
4
×
1
4
,
=
1
16
.
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