题目内容
| 200-199+198-197+196-195+…+4-3+2-1= |
| 1.8+62= | ||||||||||||||||||
44÷
| 2.4×5= | 1÷
| ||||||||||||||||||
| 3.4-1
| 2-1
| ||||||||||||||||||
| 8.8×(
| 0.75×16+
| ||||||||||||||||||
98÷
| 30
|
(1)200-199+198-197+196-195+…+4-3+2-1,
=(200-199)+(198-197)+(196-195)+…+(4-3)+(2-1),
=1×100,
=100;
(2)
×
+
×
+
×
+…+
×
,
=
-
+
-
+
-
+…+
-
,
=
-
,
=
;
(3)1.8+62=63.8;
(4)44÷
,
=44×
,
=40;
(5)2.4×5,
=(2+0.4)×5,
=2×5+0.4×5,
=10+2,
=12;
(6)1÷
+
÷1,
=1×10+
,
=10
;
(7)
÷
,
=
×
,
=
;
(8)3.4-1
,
=3.4-1.6,
=1.8;
(9)2-1
+
,
=2-(1
-
),
=2-1
,
=
;
(10)
+
+
+…+
,
=(1-
)+(
-
)+(
-
)+…+(
-
),
=1-
+
-
+
-
+…+
-
,
=1-
,
=
;
(11)8.8×(
+
+
),
=8.8×
+8.8×
+8.8×
,
=3.2+5.5+6.6,
=15.3;
(12)0.75×16+
×5-
,
=0.75×16+0.75×5-0.75,
=(16+5-1)×0.75,
=20×0.75,
=15;
(13)98÷
,
=98×
,
=(99-1)×
,
=99×
-
,
=98-
,
=97
;
(14)30
-(18.8+12×
),
=30.6-(18.8+9),
=30.6-27.8,
=2.8.
=(200-199)+(198-197)+(196-195)+…+(4-3)+(2-1),
=1×100,
=100;
(2)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 99 |
| 1 |
| 100 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 99 |
| 1 |
| 100 |
=
| 1 |
| 2 |
| 1 |
| 100 |
=
| 49 |
| 100 |
(3)1.8+62=63.8;
(4)44÷
| 11 |
| 10 |
=44×
| 10 |
| 11 |
=40;
(5)2.4×5,
=(2+0.4)×5,
=2×5+0.4×5,
=10+2,
=12;
(6)1÷
| 1 |
| 10 |
| 1 |
| 10 |
=1×10+
| 1 |
| 10 |
=10
| 1 |
| 10 |
(7)
| 3 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 4 |
| 3 |
=
| 1 |
| 2 |
(8)3.4-1
| 3 |
| 5 |
=3.4-1.6,
=1.8;
(9)2-1
| 3 |
| 4 |
| 1 |
| 4 |
=2-(1
| 3 |
| 4 |
| 1 |
| 4 |
=2-1
| 1 |
| 2 |
=
| 1 |
| 2 |
(10)
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 256 |
=(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 128 |
| 1 |
| 256 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 128 |
| 1 |
| 256 |
=1-
| 1 |
| 256 |
=
| 255 |
| 256 |
(11)8.8×(
| 4 |
| 11 |
| 5 |
| 8 |
| 3 |
| 4 |
=8.8×
| 4 |
| 11 |
| 5 |
| 8 |
| 3 |
| 4 |
=3.2+5.5+6.6,
=15.3;
(12)0.75×16+
| 3 |
| 4 |
| 3 |
| 4 |
=0.75×16+0.75×5-0.75,
=(16+5-1)×0.75,
=20×0.75,
=15;
(13)98÷
| 99 |
| 98 |
=98×
| 98 |
| 99 |
=(99-1)×
| 98 |
| 99 |
=99×
| 98 |
| 99 |
| 98 |
| 99 |
=98-
| 98 |
| 99 |
=97
| 1 |
| 99 |
(14)30
| 3 |
| 5 |
| 3 |
| 4 |
=30.6-(18.8+9),
=30.6-27.8,
=2.8.
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