问题 解答题
能简算的要简便算.
2
15
×21×
5
14
15×(
2
3
+
3
5
97×
5
96
1
3
+
1
4
+
1
24
)×24
3
5
×
2
3
+
2
5
÷1
1
2
[1-(
1
4
+
3
8
)]÷
1
4
答案

(1)

2
15
×21×
5
14

=

42
15
×
5
14

=1;

(2)15×(

2
3
+
3
5
),

=15×

2
3
+
3
5
×15,

=10+9,

=19;

(3)97×

5
96

=(96+1)×

5
96

=96×

5
96
+1×
5
96

=5

5
96

(4)(

1
3
+
1
4
+
1
24
)×24,

=24×

1
3
+24×
1
4
+
1
24
×24,

=8+6+1,

=15;

(5)

3
5
×
2
3
+
2
5
÷1
1
2

=

2
5
+
2
5
×
2
3

=

2
5
+
4
15

=

6
15
+
4
15

=

2
3

(6)[1-(

1
4
+
3
8
)]÷
1
4

=[1-

5
8
]×4,

=

3
8
×4,

=1.5;

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