题目内容
2
+1.75÷150%-
8
÷[7.5+0.625×(
-1.15)]
(
+
)×23+25÷71
×67.8+54.3÷1
-221×9%
(1-
)+(3-
×2)+(5-
×3)+…+(97-
×49)+(99-
×50)
| 6 |
| 7 |
| 1 |
| 6 |
8
| 4 |
| 5 |
| 11 |
| 4 |
(
| 1 |
| 69 |
| 2 |
| 71 |
| 9 |
| 10 |
| 1 |
| 9 |
(1-
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
(1)2
+1.75÷150%-
=2
+
-
,
=2
+(
-
),
=2
+1,
=3
;
(2)8
÷[7.5+0.625×(
-1.15)]
=8
÷[7.5+0.625×(2.75-1.15)],
=8
÷[7.5+0.625×1.6],
=8
÷[7.5+1],
=8.8÷8.5,
=
;
(3)(
+
)×23+25÷71
=
×23+
×23+
;
=
+
+
;
=
+(
+
),
=
+1,
=1
;
(4)
×67.8+54.3÷1
-221×9%
=
×67.8+54.3×
-22.1×
,
=(67.8+54.3-22.1)×
,
=100×
,
=90;
(5)(1-
)+(3-
×2)+(5-
×3)+…+(97-
×49)+(99-
×50)
=1-
+3-
×2+(5-
×3+…+97-
×49+99-
×50;
=(1+3+5+…+99)-(
+
×2+
×3+…+
×50),
=(1+99)×[(99-1)÷2+1]÷2-(
+
×50)×50÷2,
=100×50÷2-(50+1)×
×50÷2,
=2500-51×
×50÷2,
=2500-450,
=2050.
| 6 |
| 7 |
| 1 |
| 6 |
=2
| 6 |
| 7 |
| 7 |
| 6 |
| 1 |
| 6 |
=2
| 6 |
| 7 |
| 7 |
| 6 |
| 1 |
| 6 |
=2
| 6 |
| 7 |
=3
| 6 |
| 7 |
(2)8
| 4 |
| 5 |
| 11 |
| 4 |
=8
| 4 |
| 5 |
=8
| 4 |
| 5 |
=8
| 4 |
| 5 |
=8.8÷8.5,
=
| 88 |
| 85 |
(3)(
| 1 |
| 69 |
| 2 |
| 71 |
=
| 1 |
| 69 |
| 2 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 3 |
| 46 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 3 |
| 46 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 3 |
=1
| 1 |
| 3 |
(4)
| 9 |
| 10 |
| 1 |
| 9 |
=
| 9 |
| 10 |
| 9 |
| 10 |
| 9 |
| 10 |
=(67.8+54.3-22.1)×
| 9 |
| 10 |
=100×
| 9 |
| 10 |
=90;
(5)(1-
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
=1-
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
=(1+3+5+…+99)-(
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
| 18 |
| 51 |
=(1+99)×[(99-1)÷2+1]÷2-(
| 18 |
| 51 |
| 18 |
| 51 |
=100×50÷2-(50+1)×
| 18 |
| 51 |
=2500-51×
| 18 |
| 51 |
=2500-450,
=2050.
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