题目内容
脱式计算.(能简算的要简算)
(1)975×0.25+9
×76-9.75
(2)
÷[7.8+
×(
-1.15)]
(3)[2-(3.75×.1
-2
÷0.6)]÷0.2
(4)1+2
+3
+4
+5
+6
+7
+8
.
(1)975×0.25+9
| 3 |
| 4 |
(2)
| 84 |
| 5 |
| 5 |
| 8 |
| 23 |
| 4 |
(3)[2-(3.75×.1
| 1 |
| 3 |
| 2 |
| 5 |
(4)1+2
| 1 |
| 6 |
| 1 |
| 12? |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
(1)975×0.25+9
×76-9.75,
=9.75×25+9.75×76-9.75,
=9.75×(25+76-1),
=9.75×100,
=975;
(2)
÷[7.8+
×(
-1.15)],
=
÷[7.8+
×4.6],
=
÷[7.8+2.875],
=
÷10.675,
=
;
(3)[2-(3.75×.1
-2
÷0.6)]÷0.2,
=[2-(5-4)]÷0.2,
=[2-1]÷0.2,
=1÷0.2,
=5;
(4)1+2
+3
+4
+5
+6
+7
+8
.
=(1+2+3+4+5+6+7+8)+(
+
+
+
+
+
+
),
=36+(
-
+
-
+
-
+
-
+
-
+
-
+
-
),
=36+(
-
),
=36+
,
=36
.
| 3 |
| 4 |
=9.75×25+9.75×76-9.75,
=9.75×(25+76-1),
=9.75×100,
=975;
(2)
| 84 |
| 5 |
| 5 |
| 8 |
| 23 |
| 4 |
=
| 84 |
| 5 |
| 5 |
| 8 |
=
| 84 |
| 5 |
=
| 84 |
| 5 |
=
| 672 |
| 427 |
(3)[2-(3.75×.1
| 1 |
| 3 |
| 2 |
| 5 |
=[2-(5-4)]÷0.2,
=[2-1]÷0.2,
=1÷0.2,
=5;
(4)1+2
| 1 |
| 6 |
| 1 |
| 12? |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
=(1+2+3+4+5+6+7+8)+(
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
=36+(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
=36+(
| 1 |
| 2 |
| 1 |
| 9 |
=36+
| 7 |
| 18 |
=36
| 7 |
| 18 |
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