题目内容
8.3-2.1÷1.75×(1.7+0.45)
+
-(
-
)
5.4×3.2+3.2+32×0.36
+
+
+
+
+
.
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| 7 |
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| 6 |
5.4×3.2+3.2+32×0.36
| 1 |
| 2 |
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| 1 |
| 12 |
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| 30 |
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| 42 |
(1)8.3-2.1÷1.75×(1.7+0.45),
=8.3-2.1÷1.75×2.15,
=8.3-1.2×2.15,
=8.3-2.58,
=5.72;
(2)
+
-(
-
),
=
+
-
+
,
=(
-
)+(
+
),
=
+1,
=1
;
(3)5.4×3.2+3.2+32×0.36,
=5.4×3.2+3.2×1+3.2×3.6,
=(5.4+1+3.6)×3.2,
=10×3.2,
=32;
(4)
+
+
+
+
+
,
=(1-
)+(
-
)+(
-
)+(
-
)+(
-
)+(
-
),
=1-
+
-
+
-…+
-
+
,
=1-
,
=
.
=8.3-2.1÷1.75×2.15,
=8.3-1.2×2.15,
=8.3-2.58,
=5.72;
(2)
| 4 |
| 7 |
| 5 |
| 6 |
| 3 |
| 7 |
| 1 |
| 6 |
=
| 4 |
| 7 |
| 5 |
| 6 |
| 3 |
| 7 |
| 1 |
| 6 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 7 |
=1
| 1 |
| 7 |
(3)5.4×3.2+3.2+32×0.36,
=5.4×3.2+3.2×1+3.2×3.6,
=(5.4+1+3.6)×3.2,
=10×3.2,
=32;
(4)
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=1-
| 1 |
| 7 |
=
| 6 |
| 7 |
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