题目内容

4
9
×3.25+9
5
9
×3
1
4
4
5
17
-(1
5
17
+0.625);
2
5
+
1
2
)×(4-2
2
3
);
3.12÷1.2-1.2×0.6;
1998+7650÷75;(1
1
4
+2
5
6
)÷(1
1
4
×0.8-0.3).
(1)
4
9
×3.25+9
5
9
×3
1
4

=
4
9
×3.25+9
5
9
×3.25
=(
4
9
+9
5
9
)×3.25
=10×3.25
=32.5;

(2)4
5
17
-(1
5
17
+0.625)
=4
5
17
-1
5
17
-0.625
=(4
5
17
-1
5
17
)-0.625
=3-0.625
=2.375;

(3)(
2
5
+
1
2
)×(4-2
2
3

=
9
10
×
4
3

=
6
5


(4)3.12÷1.2-1.2×0.6
=2.6-0.72
=1.88;

(5)1998+7650÷75
=1998+102
=2100;

(6)(1
1
4
+2
5
6
)÷(1
1
4
×0.8-0.3)
=
49
12
÷(1-0.3)
=
49
12
÷0.7
=
49
12
÷
7
10

=
49
12
×
10
7

=
35
6
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