题目内容

计算下列各题,能简便的要简便计算
3
1
6
÷(1+
1
3
×1
3
4
)

1
15
+
2
17
)×15×17
(9.6-10
1
2
÷1.25)÷(1
1
3
×0.75)

5.66×7.28-3.16×3.16-3.16×4.12
2012×0.875+201.2×1.25
1
1×2
+
1
2×3
+
1
3×4
+…+
1
99×100
(1)3
1
6
÷(1+
1
3
×1
3
4
),
=3
1
6
÷(1+
1
3
×
7
4
),
=3
1
6
÷(1+
7
12
),
=
19
6
÷
19
12

=
19
6
×
12
19

=2;

(2)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(3)(9.6-10
1
2
÷1.25)÷(1
1
3
×0.75),
=(9.6-
21
2
÷
5
4
)÷(
4
3
×
3
4
),
=(9.6-
21
2
×
4
5
)÷1,
=(9.6-8.4)÷1,
=1.2;

(4)5.66×7.28-3.16×3.16-3.16×4.12,
=5.66×7.28-3.16×(3.16+4.12),
=5.66×7.28-3.16×7.28,
=(5.66-3.16)×7.28,
=2.5×7.28,
=18.2;

(5)2012×0.875+201.2×1.25,
=2012×0.875+2012×0.125,
=2012×(0.875+0.125),
=2012×1,
=2012;

(6)
1
1×2
+
1
2×3
+
1
3×4
+…+
1
99×100

=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+…+
1
99
-
1
100

=1-
1
100

=
99
100
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