题目内容
(1)42
×(7
-7.125)÷3
(2)3.75×4
-3
×3
(3)11
-2
-5
÷1
(4)1
÷1
+8÷5×
(5)(2÷
-
÷2)×1
(6)20×
-0.27÷
+6.81
(7)(
+
)×21÷(2.5×1
)
(8)8.1÷[(4
-0.005×700)÷1
].
| 5 |
| 13 |
| 1 |
| 8 |
| 2 |
| 3 |
(2)3.75×4
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
(3)11
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 8 |
(4)1
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
(5)(2÷
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
(6)20×
| 2 |
| 5 |
| 1 |
| 3 |
(7)(
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
(8)8.1÷[(4
| 1 |
| 7 |
| 2 |
| 7 |
(1)42
×(7
-7.125)÷3
=42
×0÷3
,
=0;
(2)3.75×4
-3
×3
=3
×4
-3
×3
,
=3
×(4
-3
),
=3
×1,
=3
;
(3)11
-2
-5
÷1
=11
-2
-
,
=
-
,
=4
;
(4)1
÷1
+8÷5×
=
+
×
,
=
+
,
=2
;
(5)(2÷
-
÷2)×1
=(3-
)×
=
×
,
=4;
(6)20×
-0.27÷
+6.81
=8-0.81+6.81,
=7.19+6.81,
=14;
(7)(
+
)×21÷(2.5×1
)
=(
×21+
×21)÷
,
=(7+3)÷
,
=10÷
,
=2
;
(8)8.1÷[(4
-0.005×700)÷1
]
=8.1÷[(4
-3.5)÷1
],
=8.1÷[
÷
],
=8.1÷
,
=16.2.
| 5 |
| 13 |
| 1 |
| 8 |
| 2 |
| 3 |
=42
| 5 |
| 13 |
| 2 |
| 3 |
=0;
(2)3.75×4
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
=3
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
=3
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 7 |
=3
| 3 |
| 4 |
=3
| 3 |
| 4 |
(3)11
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 8 |
=11
| 5 |
| 6 |
| 1 |
| 4 |
| 44 |
| 9 |
=
| 115 |
| 12 |
| 44 |
| 9 |
=4
| 25 |
| 36 |
(4)1
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
=
| 21 |
| 16 |
| 8 |
| 5 |
| 3 |
| 4 |
=
| 21 |
| 16 |
| 6 |
| 5 |
=2
| 41 |
| 80 |
(5)(2÷
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
=(3-
| 1 |
| 3 |
| 3 |
| 2 |
=
| 8 |
| 3 |
| 3 |
| 2 |
=4;
(6)20×
| 2 |
| 5 |
| 1 |
| 3 |
=8-0.81+6.81,
=7.19+6.81,
=14;
(7)(
| 1 |
| 3 |
| 1 |
| 7 |
| 3 |
| 4 |
=(
| 1 |
| 3 |
| 1 |
| 7 |
| 35 |
| 8 |
=(7+3)÷
| 35 |
| 8 |
=10÷
| 35 |
| 8 |
=2
| 2 |
| 7 |
(8)8.1÷[(4
| 1 |
| 7 |
| 2 |
| 7 |
=8.1÷[(4
| 1 |
| 7 |
| 2 |
| 7 |
=8.1÷[
| 9 |
| 14 |
| 9 |
| 7 |
=8.1÷
| 1 |
| 2 |
=16.2.
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