问题 解答题
计算,写出必要过程.
9
2
:x=2
4
7
:0.5
2
5
9
+3
9
10
-5.22
2
5
9
-6
27
50
+5.22
÷(
2006×0.4
2008×0.5
+
1.6
2008

2008×98
1
4
-225×10
1
25
+200
4
5
×28
3
4

1+2-3+4+5-6+7+8-9+…+601+602-603+604+605-606.
答案

9
2
:x=2
4
7
:0.5,

2

4
7
x=
9
2
×0.5,

2

4
7
x=
9
4

x=

7
8

2
5
9
+3
9
10
-5.22
2
5
9
-6
27
50
+5.22
÷(
2006×0.4
2008×0.5
+
1.6
2008
),

=

2
5
9
-1.32
2
5
9
-1.32
÷
1606.4
2008

=

20080
16064

=

1255
1004

③2008×98

1
4
-225×10
1
25
+200
4
5
×28
3
4

=2008×

393
4
-225×
251
25
+
1004
5
×
115
4

=197286-2259+5773,

=200800;

④1+2-3+4+5-6+7+8-9+..+601+602-603+604+605-606,
=(1+2-3)+(4+5-6)+(7+8-9)+…(604+605-606),
=0+3+6+9+…+603,
=(0+603)×202÷2,
=60903.

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