题目内容
简便运算.
+2
+3.25+3
(
+
)×15×17
68-7.5+32-2.5
-(
-
)
| 3 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
(
| 1 |
| 15 |
| 2 |
| 17 |
68-7.5+32-2.5
| 5 |
| 12 |
| 1 |
| 12 |
| 1 |
| 2 |
(1)
+2
+3.25+3
,
=(0.75+3.25)+(2
+3
),
=4+6,
=10;
(2)(
+
)×15×17,
=(
×15+
×15)×17,
=(1+
)×17,
=1×17+
×17,
=17+30,
=47;
(3)68-7.5+32-2.5,
=68+32-(7.5+2.5),
=100-10,
=90;
(4)
-(
-
),
=
-
+
,
=
+
,
=
.
| 3 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=(0.75+3.25)+(2
| 9 |
| 17 |
| 8 |
| 17 |
=4+6,
=10;
(2)(
| 1 |
| 15 |
| 2 |
| 17 |
=(
| 1 |
| 15 |
| 2 |
| 17 |
=(1+
| 30 |
| 17 |
=1×17+
| 30 |
| 17 |
=17+30,
=47;
(3)68-7.5+32-2.5,
=68+32-(7.5+2.5),
=100-10,
=90;
(4)
| 5 |
| 12 |
| 1 |
| 12 |
| 1 |
| 2 |
=
| 5 |
| 12 |
| 1 |
| 12 |
| 1 |
| 2 |
=
| 1 |
| 3 |
| 1 |
| 2 |
=
| 5 |
| 6 |
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