计算下列各题.(能简算的要简算)?
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(1)7÷
7
9 -
7
9 ÷7
=7×
9
7 -
7
9 ×
1
7 ,
=9-
1
9 ,
=8
8
9 ;
(2)15÷
8
9 +15×
7
8
=15×
9
8 +15×
7
8 ,
=15×(
9
8 +
7
8 ),
=15×2,
=30;
(3)
3
22 ÷[
5
4 ÷(
14
3 -
1
2 )]
=
3
22 ÷[
5
4 ÷
25
6 ],
=
3
22 ÷[
5
4 ×
6
25 ],
=
3
22 ÷
3
10 ,
=
3
22 ×
10
3 ,
=
5
11 ;
(4)3-
5
18 ×
27
40 -
13
16
=3-
3
16 -
13
16 ,
=3-(
3
16 +
13
16 ),
=3-1,
=2;
(5)
7
9 ×9+
7
9
=7+
7
9 ,
=7
7
9 ;
(6)
19
13 ÷
7
5 -
6
13 ×
5
7
=
19
13 ×
5
7 -
6
13 ×
5
7 ,
=(
19
13 -
6
13 )×
5
7 ,
=1×
5
7 ,
=
5
7 .,10, 计算下列各题.(能简算的要简算)
7÷ 7 9 - 7 9 ÷7= 15÷ 8 9 +15× 7 8 = 3 22 ÷[ 5 4 ÷( 14 3 - 1 2 )] 3- 5 18 × 27 40 - 13 16 = 7 9 ×9+ 7 9 19 13 ÷ 7 5 - 6 13 × 5 7 =
7
9 -
7
9 ÷7
=7×
9
7 -
7
9 ×
1
7 ,
=9-
1
9 ,
=8
8
9 ;
(2)15÷
8
9 +15×
7
8
=15×
9
8 +15×
7
8 ,
=15×(
9
8 +
7
8 ),
=15×2,
=30;
(3)
3
22 ÷[
5
4 ÷(
14
3 -
1
2 )]
=
3
22 ÷[
5
4 ÷
25
6 ],
=
3
22 ÷[
5
4 ×
6
25 ],
=
3
22 ÷
3
10 ,
=
3
22 ×
10
3 ,
=
5
11 ;
(4)3-
5
18 ×
27
40 -
13
16
=3-
3
16 -
13
16 ,
=3-(
3
16 +
13
16 ),
=3-1,
=2;
(5)
7
9 ×9+
7
9
=7+
7
9 ,
=7
7
9 ;
(6)
19
13 ÷
7
5 -
6
13 ×
5
7
=
19
13 ×
5
7 -
6
13 ×
5
7 ,
=(
19
13 -
6
13 )×
5
7 ,
=1×
5
7 ,
=
5
7 .,10, 计算下列各题.(能简算的要简算)
7÷ 7 9 - 7 9 ÷7= 15÷ 8 9 +15× 7 8 = 3 22 ÷[ 5 4 ÷( 14 3 - 1 2 )] 3- 5 18 × 27 40 - 13 16 = 7 9 ×9+ 7 9 19 13 ÷ 7 5 - 6 13 × 5 7 =
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