题目内容
计算下列各题,能简便的要简便计算
3
÷(1+
×1
)
(
+
)×15×17
(9.6-10
÷1.25)÷(1
×0.75)
5.66×7.28-3.16×3.16-3.16×4.12
2012×0.875+201.2×1.25
+
+
+…+
.
3
| 1 |
| 6 |
| 1 |
| 3 |
| 3 |
| 4 |
(
| 1 |
| 15 |
| 2 |
| 17 |
(9.6-10
| 1 |
| 2 |
| 1 |
| 3 |
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+
×1
),
=3
÷(1+
×
),
=3
÷(1+
),
=
÷
,
=
×
,
=2;
(2)(
+
)×15×17,
=
×15×17+
×15×17,
=17+30,
=47;
(3)(9.6-10
÷1.25)÷(1
×0.75),
=(9.6-
÷
)÷(
×
),
=(9.6-
×
)÷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-
,
=
.
| 1 |
| 6 |
| 1 |
| 3 |
| 3 |
| 4 |
=3
| 1 |
| 6 |
| 1 |
| 3 |
| 7 |
| 4 |
=3
| 1 |
| 6 |
| 7 |
| 12 |
=
| 19 |
| 6 |
| 19 |
| 12 |
=
| 19 |
| 6 |
| 12 |
| 19 |
=2;
(2)(
| 1 |
| 15 |
| 2 |
| 17 |
=
| 1 |
| 15 |
| 2 |
| 17 |
=17+30,
=47;
(3)(9.6-10
| 1 |
| 2 |
| 1 |
| 3 |
=(9.6-
| 21 |
| 2 |
| 5 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
=(9.6-
| 21 |
| 2 |
| 4 |
| 5 |
=(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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