题目内容

2
6
7
+1.75÷150%-
1
6

8
4
5
÷[7.5+0.625×(
11
4
-1.15)]
1
69
+
2
71
)×23+25÷71
9
10
×67.8+54.3÷1
1
9
-221×9%
(1-
18
51
)+(3-
18
51
×2)+(5-
18
51
×3)+…+(97-
18
51
×49)+(99-
18
51
×50)
(1)2
6
7
+1.75÷150%-
1
6

=2
6
7
+
7
6
-
1
6

=2
6
7
+(
7
6
-
1
6
),
=2
6
7
+1,
=3
6
7


(2)8
4
5
÷[7.5+0.625×(
11
4
-1.15)]
=8
4
5
÷[7.5+0.625×(2.75-1.15)],
=8
4
5
÷[7.5+0.625×1.6],
=8
4
5
÷[7.5+1],
=8.8÷8.5,
=
88
85


(3)(
1
69
+
2
71
)×23+25÷71
=
1
69
×
23+
2
71
×23+
25
71

=
1
3
+
46
71
+
25
71

=
1
3
+(
46
71
+
25
71
),
=
1
3
+1,
=1
1
3


(4)
9
10
×67.8+54.3÷1
1
9
-221×9%
=
9
10
×67.8+54.3×
9
10
-22.1×
9
10

=(67.8+54.3-22.1)×
9
10

=100×
9
10

=90;

(5)(1-
18
51
)+(3-
18
51
×2)+(5-
18
51
×3)+…+(97-
18
51
×49)+(99-
18
51
×50)
=1-
18
51
+3-
18
51
×2+(5-
18
51
×3+…+97-
18
51
×49+99-
18
51
×50;
=(1+3+5+…+99)-(
18
51
+
18
51
×2+
18
51
×3+…+
18
51
×50),
=(1+99)×[(99-1)÷2+1]÷2-(
18
51
+
18
51
×50)×50÷2,
=100×50÷2-(50+1)×
18
51
×50÷2,
=2500-51×
18
51
×50÷2,
=2500-450,
=2050.
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