问题 解答题
586×124+29×586-586×5321×(
3
7
+
1
3
+
4
21
+
5
14
28×5+2×4×35+21×20+14×40+8×625
1
2
+1
3
5
+3
3
8
+2
1
6
+6
2
5
+4
1
3
+
5
8
答案

(1)586×124+29×586-586×53,

=(124+29-53)×586,

=100×586,

=58600;

(2)21×(

3
7
+
1
3
+
4
21
+
5
14
),

=21×

3
7
+21×
1
3
+21×
4
21
+21×
5
14

=9+7+4+10,

=16+4+10,

=30;

(3)28×5+2×4×35+21×20+14×40+8×62,

=28×5+2×4×7×5+3×7×4×5+14×2×20+8×62,

=28×5+28×10+28×15+28×20+8×62,

=28×(5+10+15+20)+8×62,

=28×50+8×62,

=1400+496,

=1896;

(4)5

1
2
+1
3
5
+3
3
8
+2
1
6
+6
2
5
+4
1
3
+
5
8

=(5

1
2
+4
1
3
)+(1
3
5
+6
2
5
)+(3
3
8
+
5
8
),

=9

5
6
+8+4,

=21

5
6

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