题目内容

简便运算.
3
4
+2
9
17
+3.25+3
8
17

1
15
+
2
17
)×15×17
68-7.5+32-2.5
5
12
-(
1
12
-
1
2
(1)
3
4
+2
9
17
+3.25+3
8
17

=(0.75+3.25)+(2
9
17
+3
8
17
),
=4+6,
=10;

(2)(
1
15
+
2
17
)×15×17,
=(
1
15
×
15+
2
17
×15)×17,
=(1+
30
17
)×17,
=1×17+
30
17
×
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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